Sway-A-Way

High-performance Sway-A-Way tubular front torsion bars for the Porsche 914. Designed as a lightweight alternative to equivalent solid torsion bars, these hollow bars provide increased front suspension control while retaining the original torsion-bar suspension architecture. Available from 20 mm through to 23 mm.
SET OF 2, One pair is required per vehicle.

Fits:
Porsche 914-4: 1970 through 1976
Porsche 914-6: 1970 through 1972

  * Note:  Always confirm the existing front suspension and torsion-bar specification before ordering, particularly on cars that have previously been converted to 911-type front suspension components.


The tubular construction is engineered to provide the spring characteristics associated with the stated solid torsion-bar rate while removing unnecessary material from the centre of the bar.

This reduces weight without giving up the intended suspension rate, making the tubular range particularly attractive for lightweight road cars, track-day builds and competition Porsche 914s.

As the front suspension moves, the torsion bar twists along its axis. Increasing the torsion-bar rate increases resistance to this twisting movement, helping control front suspension compression, braking dive and body roll.

The result is a more responsive front end and greater suspension control when the torsion bars are correctly matched with the rest of the chassis setup.

Choosing the Correct Torsion Bar Rate

  20 mm Tubular (Competition Grade)

The 20 mm tubular front torsion bar is the mildest option in this particular hollow performance range. It provides a substantial performance-oriented front spring rate while retaining the weight advantage of tubular construction.

Spring Rate: Extreme increase over stock (Over 3x the stiffness of original 11mm bars)
Note: Designed to provide the same effective spring rate as a 20mm solid bar but with a significant weight advantage.

Recommended for:
•  Performance road cars
•  Fast-road Porsche 914 builds
•  Occasional track days
•  Autocross
•  Six-cylinder conversions
•  Cars using uprated dampers and rear springs

Critical Installation & Setup Notes
•  Mandatory Rear Upgrades: Running 20mm front bars with stock rear springs will result in extreme understeer. To maintain the 914's signature mid-engine agility, you must pair these with high-rate rear competition coil springs.
•  Shock Damping: Standard street shocks cannot control this spring rate. Competition-valved dampers (such as Bilstein RSR or custom-valved Koni Racing) are required to prevent the front end from becoming dangerously "bouncy."
•  Chassis Stress: A 20mm bar is incredibly rigid. Inspect your torsion bar mounting points and A-arm brackets for any signs of fatigue or rust. Reinforcing these areas is highly recommended for racing applications.
•  Indexing: Because these bars are so stiff, ride height adjustment is hyper-sensitive. A single spline of "clocking" adjustment will move the car’s height significantly. 

  21 mm Tubular (Tubular construction for weight savings)

Enhance your Porsche 914’s suspension with this 21mm tubular torsion bar set, designed for improved handling and reduced weight. A direct replacement for stock bars, these provide consistent performance and durability.

Recommended for:
•   Track-focused Porsche 914s
•   914 GT-style builds
•   High-performance engine conversions
•   Autocross
•   Wide-tyre applications
•   Performance-valved dampers

  22 mm Tubular (Tubular construction for weight reduction)

The 22 mm tubular front torsion bar is a high-rate performance option aimed principally at serious track and competition use.
Upgrade your Porsche 914’s suspension with this 22mm tubular torsion bar set, designed for enhanced handling and weight savings. A direct replacement for stock bars, these offer reliable performance while reducing unsprung weight.

Recommended for:
•  Dedicated track cars
•  Motorsport-inspired builds
•  High-grip tyres
•  Lightweight race cars
•  High-output engine conversions
•  Competition dampers
•  Appropriately uprated rear spring rates

  23 mm Tubular (Extreme Competition Grade)

The ultimate "weight-optimized" front suspension solution for competition-level Porsche 914s. These 23mm tubular torsion bars provide the maximum spring rate available for the 914 chassis while utilizing a hollow core to significantly reduce unsprung weight. Engineered for high-horsepower conversions (V8 or 3.6L swaps) and dedicated GT-class racing, these bars deliver extreme roll resistance and front-end stability without the heavy mass of a solid 23mm bar.

Spring Rate: Maximum performance increase (Over 5x the stiffness of original factory bars)
Note: The "T" designation indicates a tubular design. This bar provides the exact same spring rate as a 23mm solid bar but with superior suspension recovery speeds due to the lower weight.

Recommended for:
•  Dedicated race cars
•  Motorsport applications
•  GT-style competition builds
•  High-horsepower conversions
•  Racing slicks or very high-grip tyres
•  Competition-valved dampers
•  Fully developed suspension packages


Why Upgrade the Front Torsion Bars?

 The torsion bars act as the front springs in the Porsche 914 suspension.

Increasing their effective rate can provide:
•  Reduced nose-dive under braking
•  Reduced body roll
•  Sharper steering response
•  Improved suspension control
•  More consistent chassis behaviour under load
•  Better support for modern performance tyres
•  Improved track performance

The higher the torsion-bar rate, the more important it becomes to ensure that the rest of the suspension is correctly matched.

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

FS19

The product you are viewing cross references to these numbers

High-performance Sway-A-Way solid front torsion bars for Porsche 914 suspension applications. Designed as direct replacements for the original front torsion bars, these bars provide a simple and effective way to restore or increase front suspension spring rate while retaining the Porsche 914's original torsion-bar suspension design.
SET OF 2, One pair is required per vehicle.

Fits:
Porsche 914-4: 1970 through 1976
Porsche 914-6: 1970 through 1972

  * Note: Always confirm the required torsion-bar diameter and vehicle suspension specification before ordering. Please confirm the front suspension and torsion-bar configuration before ordering for a Porsche 914-6.

The factory Porsche 914 front suspension uses 17.9 mm torsion bars, making the 17.9 mm Sway-A-Way option particularly appropriate where original-style spring characteristics are required. Larger 19 mm through 23 mm bars progressively increase the front spring rate for performance-oriented suspension setups.

As the front suspension moves, each torsion bar twists along its axis. Increasing the bar diameter increases its resistance to twisting, resulting in a higher spring rate.

An appropriately selected larger front torsion bar can help reduce nose-dive under braking, control body roll and provide sharper chassis response during cornering.

Manufactured using solid high-strength 4340 alloy steel, Sway-A-Way torsion bars are designed to withstand repeated torsional loading while providing consistent spring characteristics.

Choosing the Correct Torsion Bar Rate

 17.9 mm Solid

The 17.9 mm solid front torsion bar is the closest choice to the original Porsche 914 front torsion-bar diameter.

It is well suited to road cars where maintaining compliant, factory-style suspension characteristics is the priority.

Spring Rate: Significant increase over stock 914/4 and 914/6 rates. 
Note: This set is a direct replacement for the front factory bars. It is available in both solid and tubular designs to suit your specific build requirements.

Recommended for:
•  Standard road cars
•  Original-specification restorations
•  Touring use
•  Street-driven 914s
•  Suspension refresh projects
•  Cars where ride quality remains important

This is an excellent choice when replacing aged original bars without substantially increasing the front spring rate.

Installation & Performance Notes
•  Balanced Handling: Because 17.9mm front bars are substantially stiffer than stock, you must ensure your rear springs (coil springs on the 914) are matched accordingly. Running these with stock rear springs may induce significant understeer.
•  Indexing: The 914 front suspension uses the same spline-indexing system as the 911. Proper "clocking" is essential to achieve your desired ride height. Document the position of your original bars before removal.
•  Lubrication: Always apply a high-quality waterproof grease to the splines during installation to prevent "creaking" and ensure the bars do not seize in the A-arms or adjustment caps over time.

 19 mm Solid  (High-Performance)

The 19 mm solid front torsion bar provides a noticeable increase in front spring rate compared with the standard 17.9 mm configuration.

It offers improved front-end control while remaining a practical choice for performance road and fast-road cars.

Spring Rate: Significant increase over stock 914-4 and 914-6 rates
Note: Engineered as a direct-fit replacement for the factory front torsion bars.

Recommended for:
•  Fast-road Porsche 914s
•  Performance road builds
•  914-6 conversions
•  Uprated dampers
•  Modern performance tyres
•  Occasional track-day use

The increased stiffness can help reduce body roll and nose-dive while providing a more immediate steering response.

Installation & Performance Notes
•   System Balance: Because 19mm front bars are extremely stiff for a lightweight 914, you must upgrade your rear coil springs to maintain a neutral handling balance. Failure to do so will result in significant understeer (pushing) in corners.
•   Shock Damping: Standard comfort shocks will likely be insufficient for this spring rate. For the best performance, pair these with sport-valved dampers (such as Bilstein Sport or Koni) to control the increased rebound force.
•   Indexing: The 914 uses a spline-indexing system to set ride height. Because the 19mm bar is so stiff, even a single spline of "clocking" will result in a dramatic change in height. Document your original bar position before removal.
•   Lubrication: Thoroughly clean the female splines in the A-arms and apply a generous coat of high-pressure waterproof grease during installation to prevent seizing and "creaking" noises. 

  20 mm Solid   (Competition Grade)

The 20 mm solid torsion bar moves further toward a performance-focused suspension setup.

It provides significantly increased resistance to front suspension movement and is suitable for cars with complementary rear spring and damper upgrades.

Spring Rate: Extreme increase over stock (Over 3x the stiffness of original 11mm bars)
Note: Available in both solid and tubular designs to fit your weight-reduction goals.

Recommended for:
•    Aggressive fast-road use
•    Road / track builds
•    Autocross
•    914 GT-style projects
•    Higher-powered engine conversions
•    Performance dampers

Critical Installation & Setup Notes
•  Chassis Stress: A 20mm bar is incredibly stiff. You must inspect your torsion bar mounting points for any signs of fatigue or rust. For racing applications, reinforcing the chassis at the A-arm mounts is highly recommended.
•  Mandatory Rear Upgrades: Running 20mm front bars with anything near stock rear springs will result in a car that refuses to turn (extreme understeer). You must pair these with high-rate rear competition coil springs to maintain the 914's signature mid-engine agility.
•  Shock Damping: Standard street shocks cannot control this spring rate. Competition-valved dampers (such as Bilstein RSR or custom-valved Koni Racing) are required to prevent the front end from becoming dangerously "bouncy."
•  Indexing: Because these bars are so rigid, indexing is hyper-sensitive. A single spline of adjustment will move the car’s ride height significantly. 

  21 mm Solid    (Extreme Competition Grade) 

The 21 mm solid front torsion bar is a high-rate option intended primarily for track-focused and highly modified Porsche 914 applications.

It provides substantial resistance to body roll and braking dive and should be used as part of a properly balanced suspension package.

Spring Rate: Maximum stiffness (Approximately 4x the rate of factory 4-cylinder bars)
Note: This is an exceptionally rigid bar. It is designed as a direct-fit replacement for the factory front torsion bars but intended only for highly modified chassis.

Recommended for:
•   Track-focused Porsche 914s
•   Competition-inspired builds
•   High-powered six-cylinder conversions
•   Wide-tyre applications
•   Autocross
•   Competition-valved dampers

Critical Performance & Setup Notes
•  Chassis Reinforcement: A 21mm bar transfers immense loads to the chassis. It is mandatory to inspect and likely reinforce the front torsion bar mounting bulkheads and A-arm pivot points to prevent metal fatigue or tearing.
•   Matched Rear Springs: To prevent uncontrollable understeer, you must use very high-rate rear coil springs. This bar is generally paired with rear springs in the 250–350 lb/in range, depending on vehicle weight and tire choice.
•   Damping: This spring rate requires professional-grade, custom-valved dampers. Standard performance shocks will not have sufficient rebound control, leading to a dangerous "pogo" effect on uneven surfaces.
•  Ride Quality: This setup will be extremely harsh on public roads. It is optimized for smooth track surfaces and maximum lateral grip. 

  22 mm Solid    (Extreme Competition / Heavy Conversion Grade)

The 22 mm solid front torsion bar provides a very high front spring rate for serious performance and motorsport applications.

Spring Rate: Maximum performance increase (Approximately 4.5x the rate of factory 4-cylinder bars)
Note: This bar is intended for highly modified vehicles. It provides a massive leap in front-end stiffness compared to the factory 11mm–13mm bars.

Recommended for:
•  Dedicated track cars
•  Motorsport builds
•  High-grip tyre packages
•  Lightweight competition cars
•  Large-engine conversions
•  Cars with suitably matched rear springs
•  Competition suspension systems

Road comfort will be considerably reduced compared with the smaller sizes.

Critical Installation & Performance Notes
•  Chassis Reinforcement Mandatory: A 22mm bar is rigid enough to potentially damage an unreinforced factory chassis. It is essential to reinforce the front torsion bar mounting points and A-arm bulkheads to prevent metal fatigue or structural failure.
•  System Balance: You must utilize very high-rate rear coil springs (typically 300+ lb/in) to balance the vehicle's handling. Using these with standard rear springs will make the car nearly impossible to turn (severe understeer).
•  Damping Requirements: Standard or even "Sport" street shocks are insufficient for this rate. Custom-valved racing dampers are required to control the rapid oscillation and prevent a dangerous "pogo" effect.
•  Spline Care: Apply a generous layer of high-pressure waterproof grease to the splines during installation to prevent seizing and eliminate the "popping" noises common in high-rate torsion setups. 

  23 mm Solid   (Extreme Competition Grade)

The 23 mm solid torsion bar is the most aggressive option in this range.

Designed for highly developed competition cars, it provides extremely high resistance to front suspension movement and should only be considered as part of a complete motorsport suspension setup.

Spring Rate: Maximum stiffness (Over 5x the rate of factory 4-cylinder bars)
Note: This is a specialized racing component. It is intended for vehicles where the factory front-end geometry must remain absolutely flat under extreme cornering loads or high aerodynamic downforce

Recommended for:
•  Dedicated race cars
•  Motorsport
•  High-horsepower conversions
•  Full competition tyre setups
•  Professionally developed chassis
•  Competition dampers and rear spring rates

Professional suspension setup is strongly recommended at this level of stiffness.

Critical Performance & Setup Notes
•  Chassis Reinforcement MANDATORY: A 23mm bar transfers immense loads to the chassis. It is essential to reinforce the front torsion bar mounting bulkheads and A-arm pivot points. Failure to do so can result in metal fatigue or the mounting points literally tearing away from the factory sheet metal.
•  Matched Rear Springs: To prevent uncontrollable understeer, you must use extremely high-rate rear coil springs. This bar is typically paired with rear springs in the 350–450 lb/in range, depending on vehicle weight and tire choice.
•  Damping: This spring rate requires professional-grade, custom-valved racing dampers. Standard performance shocks will not have sufficient rebound control, which could lead to a dangerous "pogo" effect on track surfaces.
•  Ride Quality: This setup is not recommended for street use. The 23mm solid bar is so rigid that it will transmit nearly all road imperfections directly into the chassis. 


Why Upgrade the Front Torsion Bars?

 The torsion bars act as the front springs in the Porsche 914 suspension system.

Increasing their diameter raises the spring rate and can provide:
•  Reduced nose-dive under braking
•  Reduced body roll
•  Sharper steering response
•  Improved front suspension control
•  Greater stability during aggressive cornering
•  Better support for high-grip tyres

More predictable behaviour during track use However, increasing front spring rate also affects the overall handling balance of the mid-engined Porsche 914.

Solid Construction

These Sway-A-Way torsion bars use solid alloy-steel construction.

Solid bars provide:
•  Proven suspension technology
•  High torsional strength
•  Excellent durability
•  Predictable spring characteristics
•  Wide range of spring-rate choices
•  Competitive pricing compared with hollow alternatives
•  Suitability for both road and competition use

They are an excellent choice where suspension performance and durability are more important than the weight reduction offered by tubular torsion bars.

Precision Manufacturing

Sway-A-Way torsion bars are manufactured using performance-focused processes designed to produce consistent spring characteristics.

Construction includes:
•  High-strength alloy steel
•  Heat treatment
•  Shot peening
•  Precision centreless grinding
•  Controlled outside diameter
•  Protective powder coating

These processes help provide high fatigue resistance and consistent behaviour between the left and right bars.

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

FS19

The product you are viewing cross references to these numbers

High-performance Sway-A-Way tubular rear torsion bar set for Porsche 924 and Porsche 944 models. Available in rates from 25 mm through to 31 mm, these lightweight tubular torsion bars allow the rear suspension of the Porsche 924 or 944 to be tailored for fast-road, track-day and motorsport applications.
SET OF 2, One pair is required per vehicle.

Fits:
Porsche 924 1977 - 1988
Porsche 944 1982 - 1991

  * Note: For Porsche 944 Turbo, Turbo S, S2 and other higher-performance models, always confirm the original suspension specification before selecting a replacement rate.


Designed as a lightweight performance replacement for the original rear torsion bars, these hollow bars provide the spring rate associated with the stated solid torsion-bar size while reducing overall component weight.

The Porsche 924 and 944 use torsion bars as the primary rear suspension springs. As the suspension moves, each torsion bar twists along its axis, generating the spring force required to support and control the rear of the vehicle.

Increasing the torsion-bar rate increases resistance to suspension movement, helping to reduce body roll and rear-end squat while providing more precise chassis control during acceleration, braking and cornering.

Sway-A-Way's tubular construction is particularly attractive for performance-focused Porsche builds because the internal diameter is engineered so that the hollow bar provides the intended spring rate while using less material than the equivalent solid bar.

 The result is a high-performance torsion bar offering an excellent combination of spring-rate control, strength and reduced weight.

Available Tubular Torsion Bar Rates

  25 mm Tubular  (High-Performance Street/Track)

The 25 mm tubular rear torsion bar is the mildest option in this hollow-bar range. It offers increased suspension control while retaining greater road usability than the larger competition-oriented sizes.

Recommended for:
•  Performance road cars
•  Fast-road Porsche 924 / 944 builds
•  Uprated dampers
•  Occasional track-day use
•  Drivers wanting a lightweight torsion-bar upgrade.

This is particularly suitable for cars where improved rear control is wanted without moving immediately to an extremely stiff track setup.

Critical Fitment Exceptions:
Even if your vehicle falls into the year ranges above, you must verify it does not meet these specific exceptions:
•  Porsche 944 Turbo / S2: These high-performance models often left the factory with 25.5mm bars. Installing a 25mm bar would be a slight downgrade in stiffness.
•  Performance Tuning: A 25mm bar is roughly 65% stiffer than a factory 22mm bar. While the tubular design reduces weight, the ride will be significantly firmer. We highly recommend pairing these with performance-valved shocks to manage the increased spring frequency.

 26 mm Tubular   (Competition / Weight Reduction)

The 26 mm tubular torsion bar provides a substantial increase in rear spring rate while maintaining the weight advantage of hollow construction.

Recommended for:
•  Fast-road / track-day cars
•  Autocross
•  Performance Porsche 944 builds
•  Higher-grip tyre packages
•  Cars equipped with performance-valved dampers

The increased rate helps control suspension compression and rear-end movement during aggressive driving.

Critical Fitment Exceptions
Even if your vehicle falls into the year ranges above, you must verify it does not meet these specific exceptions: 
•  Extreme Stiffness Warning: A 26mm spring rate is approximately 95% stiffer than a factory 22mm bar. Even with the weight savings of a tubular design, the ride will be very rigid.
•  High-Performance Dampers Required: Standard street shocks cannot control the high rebound energy of a 26mm bar. You must pair these with performance-valved or adjustable shocks to avoid dangerous "pogo" handling.

  27 mm Tubular   (Extreme Performance / Weight Reduction)

The 27 mm tubular rear torsion bar moves firmly into track-focused suspension territory. It provides significantly greater resistance to rear suspension movement and is ideal for performance builds where chassis response takes priority over standard ride comfort.

Recommended for:
•  Regular track days
•  Autocross
•  High-performance Porsche 944 builds
•  Turbo / S2 performance applications
•  High-grip tyres
•  Appropriately valved performance dampers

Critical Fitment Exceptions
Even if your vehicle falls into the year ranges above, you must verify it does not meet these specific exceptions: 
•  Competition Stiffness Warning: A 27mm spring rate is over 125% stiffer than a factory 22mm bar. This setup is strictly recommended for track-dedicated vehicles or professional-grade competition builds.
•  Advanced Damping Required: Standard street shocks cannot control the high rebound energy of a 27mm bar. You must pair these with race-valved or adjustable shocks (such as Koni Sport or Bilstein B6/B8) to avoid dangerous handling characteristics.

  28 mm Tubular   (Extreme Competition / Weight Reduction)

The 28 mm tubular torsion bar provides a high rear spring rate for serious performance applications.

Recommended for:
•  Track-focused Porsche 924 / 944 builds
•  Competition-inspired cars
•  Lightweight track cars
•  High-grip tyre packages
•  Performance or competition dampers

Critical Fitment Exceptions
Even if your vehicle falls into the year ranges above, you must verify it does not meet these specific exceptions: 
•  Extreme Stiffness Warning: A 28mm spring rate is over 160% stiffer than a factory 22mm bar. Even with the weight savings of a tubular design, the ride will be incredibly rigid.
•  Advanced Damping Required: Standard street shocks cannot control the high rebound energy of a 28mm bar. You must pair these with race-valved or adjustable shocks (e.g., Koni Sport or Bilstein B8) to avoid dangerous "pogo" handling.

At this level, the front and rear suspension should be considered together to maintain the intended chassis balance.

  29 mm Tubular  (Extreme Competition / Weight Reduction)

The 29 mm tubular rear torsion bar is aimed primarily at highly developed track and competition vehicles.

Recommended for:
•  Dedicated track cars
•  Motorsport
•  High-power Porsche 944 Turbo builds
•  High-grip competition tyres
•  Race-valved dampers
•  Fully developed suspension packages

This rate represents a major increase in rear suspension stiffness and is generally most appropriate when road comfort is a secondary consideration.

Critical Fitment & Safety Warnings
Before installing, please verify these high-performance requirements:
•  Race-Only Stiffness: A 29mm spring rate is over 200% stiffer than a factory 22mm bar. Even with the weight savings of a tubular design, the ride will be incredibly rigid and may cause chassis fatigue without reinforced mounting points.
•  Advanced Damping Required: Standard street shocks cannot control the massive rebound energy of a 29mm bar. You must pair these with race-valved or adjustable shocks (e.g., Koni Sport or Bilstein B8) to avoid dangerous "pogo" handling.

 30 mm Tubular   (Ultimate Competition / Weight Reduction)

The 30 mm tubular rear torsion bar provides an extremely high spring rate combined with the reduced weight of hollow construction.

Recommended for:
•  Dedicated race cars
•  Motorsport applications
•  High-output Porsche 944 builds
•  Competition suspension systems
•  Race tyres
•  Professionally developed chassis setups

Appropriately matched dampers are essential when using a torsion bar of this rate.

Critical Fitment & Safety Warnings
Because a 30mm bar is over 250% stiffer than a factory 22mm bar, please verify these requirements:
•  Chassis Stress: This level of rigidity exerts immense force on the chassis. We highly recommend reinforced torsion housings and heavy-duty spring plates to prevent metal fatigue or cracking.
•  Mandatory Damper Upgrade: Standard street shocks cannot control the massive rebound energy of a 30mm bar. You must pair these with race-valved or adjustable shocks (e.g., Koni Sport or Bilstein B8) to avoid dangerous "pogo" handling.
•  Street Use: This setup will be punishingly stiff on public roads and is generally reserved for dedicated track or off-road competition use.

 31 mm Tubular  (Ultimate Competition / Maximum Weight Savings)

The 31 mm tubular rear torsion bar represents the most aggressive option in this range. Designed for highly developed motorsport applications, this rate is intended for vehicles where maximum suspension control takes priority over road compliance.

Recommended for:
•  Dedicated competition cars
•  Motorsport
•  High-grip race tyres
•  Lightweight race builds
•  High-power applications
•  Competition dampers
•  Professionally engineered suspension packages

Professional chassis setup is strongly recommended when moving to this level of rear spring stiffness.

Critical Fitment & Safety Warnings
This is a specialized racing component. Please verify the following before installation:
• Extreme Rigidity: A 31mm spring rate is over 290% stiffer than a factory 22mm bar. This setup is strictly for dedicated track vehicles or professional-grade competition. It will be punishingly stiff for street use.
• Advanced Damping Required: You must pair these with race-valved, high-pressure gas shocks (e.g., Bilstein Cup or Koni Race). Standard street shocks cannot control the high rebound energy of a 31mm bar, which can lead to dangerous "pogo" handling.
• Chassis Reinforcement: Due to the massive torque these bars exert on the rear suspension carrier, we highly recommend inspecting and reinforcing your torsion housing and using heavy-duty spring plates.

Important Fitment Information

These bars use the 26 9/16-inch long rear torsion-bar configuration.

Always verify: Torsion-bar length,  Spline count,  Original spring rate,  Vehicle model,  Suspension specification before ordering.

Some Porsche 944 performance models were equipped with comparatively large factory torsion bars, so choosing a smaller replacement may not result in an increase in rear spring rate.


Tubular Construction

Sway-A-Way tubular torsion bars are designed to provide the required spring rate while removing material that is not necessary to achieve that rate.

The internal diameter is calculated so the hollow bar provides the spring characteristics associated with the equivalent solid torsion-bar size.

This means the tubular design is principally a weight-saving solution, rather than a softer version of the same diameter bar.

Sway-A-Way states that its tubular Porsche 924 / 944 bars can save approximately 5 lb per set compared with equivalent solid versions.

Benefits include:
•  Reduced suspension component weight
•  Equivalent target spring rate to the corresponding solid bar
•  High torsional strength
•  Excellent fatigue resistance
•  Performance-oriented construction
•  Ideal for lightweight road and competition builds.

Precision Manufacturing

Sway-A-Way tubular torsion bars are manufactured using high-strength alloy steel and a performance-focused production process

Construction includes:
•  Tubular aircraft-grade alloy steel
•  Heat treatment
•  Through-hardening
•  Shot peening
•  Precision centreless grinding
•  Controlled dimensions
•  Powder-coated corrosion protection

These processes help provide predictable spring characteristics and durability under repeated high-load suspension movement.

Why Upgrade Rear Torsion Bars?

The rear torsion bars determine a major part of the Porsche 924 / 944 rear spring rate.

Increasing the torsion-bar rate can provide:
•  Reduced body roll
•  Reduced rear-end squat
•  Improved chassis response
•  Better suspension control
•  Greater stability during fast cornering
•  Improved support for performance tyres
•  More consistent behaviour during track driving

The larger the stated torsion-bar rate, the greater the suspension stiffness.

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

RT12

The product you are viewing cross references to these numbers

High-performance Sway-A-Way solid rear torsion bar set for Porsche 924 and Porsche 944 models. Available in sizes from 23 mm through to 30 mm, these torsion bars allow the rear suspension spring rate to be tailored to suit anything from a road-focused sports car through to a dedicated track or competition build.
SET OF 2, One pair is required per vehicle.

Fits:
Porsche 924 1977 - 1988
Porsche 944 1982 - 1991

  * Note: For Porsche 944 Turbo, S2 and other higher-performance variants, always check the original rear torsion-bar specification before selecting a replacement rate, as some models were equipped with larger factory bars.


The Porsche 924 and 944 rear suspension uses torsion bars as its primary springing medium. As the suspension moves, the torsion bar twists along its axis, providing the spring force required to support and control the rear of the vehicle.

Increasing the torsion-bar diameter increases resistance to twisting and therefore raises the effective rear spring rate. The result can be reduced body roll, less rear-end squat under acceleration and more precise suspension control during fast cornering.

Sway-A-Way manufactures these bars using solid high-strength alloy steel, with heat treatment and precision centreless grinding to provide consistent dimensions, predictable spring characteristics and long-term durability.

Available Torsion Bar Sizes

  23 mm Solid   (Standard / Mild Upgrade)

The 23 mm solid rear torsion bar is the mildest option in this range and is well suited to road cars where improved suspension control is required without moving immediately to a very stiff performance setup.

Recommended for:
 •  Road use
 •  Mild suspension upgrades
 •  Touring cars
 •  Restoration and refresh projects
 •  Cars where ride compliance remains important

Critical Fitment Exceptions:
Even if your car falls into the year ranges above, verify these specific exclusions:
•   Porsche 944 Turbo / S2: Performance models often utilize a different factory diameter and may require a larger upgrade (25mm+) to see a noticeable handling benefit.
•   Spring Plate Compatibility: Ensure your spring plate bushings are in good condition. A 23mm bar is roughly 25% stiffer than a stock 22mm bar, which increases the load on your rubber or urethane bushings.

 24 mm Solid   (Sport / Street Upgrade)

The 24 mm solid rear torsion bar provides a modest increase in rear spring rate and offers a useful balance between road comfort and improved chassis response.

Recommended for:
•   Road and fast-road use
•   Weekend sports cars
•   Uprated dampers
•   Mild performance builds
•   Occasional spirited driving

Critical Fitment Exceptions:
Even if your car falls into the year ranges above, you must ensure it does not fall under these exceptions:
•   Porsche 944 Turbo / S2: These performance-oriented Porsche models often came with larger factory bars (25.5mm+); installing a 24mm bar would actually be a downgrade in stiffness.
•  Significant Stiffness Increase: A 24mm bar is roughly 40% stiffer than a stock 22mm bar. This upgrade is highly recommended for autocross or spirited street driving but may require upgraded shock valving to control the increased rebound speed.

  25 mm Solid

The 25 mm solid torsion bar provides a more noticeable increase in rear suspension stiffness. It is a strong choice for performance road cars and occasional track use where reduced body movement and sharper chassis response are priorities.

Recommended for:
•  Fast-road builds
•  Occasional track days
•  Uprated dampers
•  Performance tyres
•  Modified suspension setups

  26 mm Solid   (Competition / Heavy-Duty Upgrade)

The 26 mm solid rear torsion bar moves further toward a dedicated performance setup, providing substantially increased resistance to rear suspension compression.

Recommended for:
•  Fast-road / track cars
•  Autocross
•  Higher-powered Porsche 944 models
•  Uprated dampers
•  High-grip tyres
•  Performance suspension packages

Critical Fitment Exceptions:
Even if your vehicle falls into the year ranges above, you must verify it does not meet these specific exceptions:
•  Extreme Stiffness Warning: A 26mm bar is approximately 95% stiffer than a factory 22mm bar. This results in a very rigid ride quality. For street-driven cars, this may be excessively harsh without professional-grade dampers.
•  Shock Absorber Compatibility: You must pair these bars with performance-valved shocks. Standard street shocks will be unable to control the high rebound energy of a 26mm bar, potentially leading to "pogo" handling.

  27 mm Solid

The 27 mm solid rear torsion bar is a serious performance upgrade. It provides greater roll stiffness and reduced rear-end squat, making it well suited to track-focused and competition-inspired Porsche 924 / 944 builds.

Recommended for:
•  Track days
•  Autocross
•  Motorsport-inspired cars
•  High-performance road builds
•  Cars with appropriately matched dampers

Critical Fitment Exceptions:
Even if your vehicle falls into the year ranges above, you must verify it does not meet these specific exceptions:
•    Competition Stiffness Warning: A 27mm spring rate is over 125% stiffer than a factory 22mm bar. This setup is strictly recommended for track-dedicated vehicles or professional-grade competition builds.
•    Advanced Damping Required: Standard street shocks cannot control the high rebound energy of a 27mm bar. You must pair these with race-valved or adjustable shocks (such as Koni Sport or Bilstein B6/B8) to avoid dangerous handling characteristics.

  28 mm Solid  (Extreme Competition / Heavy-Duty)

The 28 mm solid rear torsion bar provides a high spring rate intended primarily for more focused performance and competition applications.

Recommended for:
•  Dedicated track cars
•  Competition builds
•  High-grip tyre packages
•  Lightweight cars
•  Performance or race-valved dampers

At this level, the complete suspension setup should be considered rather than changing the rear spring rate in isolation.

Critical Fitment & Safety Warnings
Before installing, please verify these high-performance requirements:
•   Extreme Stiffness: A 28mm bar is roughly 160% stiffer than a factory 22mm bar. This results in an incredibly rigid ride quality that may be unsuitable for regular street use without reinforced chassis mounts.
•   Damper Compatibility: You must pair these with high-end, race-valved adjustable shocks (e.g., Koni Sport or Bilstein B8). Standard street shocks cannot control the high rebound energy of a 28mm bar, which can cause dangerous handling and "pogoing."

  29 mm Solid  (Extreme Competition / Heavy-Duty)

The 29 mm solid torsion bar is an extreme performance option intended for highly developed track and competition vehicles. This solid Sway-A-Way bar excels in demanding applications, including performance versions of the Porsche 944 Turbo and S2 models.

Recommended for:
•  Competition cars
•  High-power track builds
•  Motorsport
•  Very high-grip tyres
•  Race-valved dampers
•  Highly developed chassis setups

Critical Fitment & Safety Warnings
Before installing, please verify these high-performance requirements:
•  Race-Only Stiffness: A 29mm bar is roughly 200% stiffer than a factory 22mm bar. This results in an incredibly rigid ride quality that is generally unsuitable for street use and may cause chassis fatigue without reinforced mounting points.
•  Damper Compatibility: You must pair these with high-end, race-valved adjustable shocks. Standard street shocks cannot control the massive rebound energy of a 29mm bar, which can cause dangerous handling and "pogoing."

  30 mm Solid   (Ultimate Competition / Heavy-Duty)

The 30 mm solid rear torsion bar is the stiffest solid option in this range. Designed primarily for competition applications, it provides very high resistance to body roll and rear suspension compression.

Recommended for:
•  Dedicated race cars
•  Motorsport applications
•  High-power Porsche 944 builds
•  Competition tyres
•  Race suspension systems

Applications where maximum chassis control takes priority over road comfort

Critical Fitment & Safety Warnings:
Because a 30mm bar is over 250% stiffer than a factory 22mm bar, please verify these requirements:
•  Chassis Stress: This level of rigidity exerts immense force on the chassis. We highly recommend reinforced torsion housings and heavy-duty spring plates to prevent metal fatigue or cracking.
•  Mandatory Damper Upgrade: Standard street shocks cannot control a 30mm bar. The rebound energy will be violent and dangerous without high-end, race-valved adjustable dampers (e.g., Koni Yellow or Bilstein B8/Cup).
•  Street Use: This setup will be punishingly stiff on public roads and is generally reserved for dedicated track or off-road competition use.


Why Upgrade the Rear Torsion Bars?

Larger rear torsion bars can provide:
•    Reduced body roll
•    Reduced rear-end squat
•    Improved rear suspension control
•    Faster chassis response
•    Better support for performance tyres
•    Increased stability during hard cornering
•    Improved track performance

The larger the torsion-bar diameter, the higher the spring rate and the firmer the suspension will become.

Solid Construction

These Sway-A-Way torsion bars use traditional solid alloy-steel construction.

 Solid torsion bars offer:
•    High torsional strength
•    Excellent durability
•    Predictable spring characteristics
•    Proven suspension technology
•    Wide range of available spring rates
•    Excellent value compared with hollow alternatives
•    Suitability for road and motorsport use

For owners who prioritise spring-rate selection and durability over the weight saving offered by tubular bars, the solid range provides an excellent suspension upgrade.

Precision Manufacturing

Sway-A-Way specifies:
•    High-strength alloy steel
•    Heat treatment
•    Precision centreless grinding
•    Consistent outside diameter
•    Controlled spring characteristics
•    Protective powder coating

These processes are designed to provide consistent suspension behaviour while improving fatigue resistance and durability.

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

RS12

The product you are viewing cross references to these numbers

High-performance Sway-A-Way solid rear torsion bars for the Porsche 911 1965-86, designed as a direct replacement and performance upgrade for the original rear torsion bars. The Sway-A-Way solid range is available from a relatively road-friendly 22 mm through to the much firmer 30 mm competition specification, making it possible to tailor the suspension to the vehicle's weight, tyres, dampers and intended use.
SET OF 2, One pair is required per vehicle.

Fits:
Porsche 911 / 912: 1965 through 1986 

 * Rear axle application using the 24 11/16-inch short torsion-bar configuration
 * These bars Does not fit 1987–1989 Porsche 911 models. The G50-equipped cars require longer torsion bars and have a different spline configuration.


Designed as direct replacements for the original rear torsion bars, these performance bars provide a straightforward way to restore or increase the rear suspension spring rate while retaining the classic Porsche torsion-bar suspension layout.

Available Torsion Bar Sizes

  22 mm (Stock / Mild Upgrade)

The 22 mm solid torsion bar is the mildest option in the range and is particularly suitable for standard or lightly modified road cars. It provides a factory-style or mild performance spring rate while offering the benefits of a new, high-quality replacement torsion bar.

Recommended for:
 •  Standard road cars
 •  Restoration projects
 •  Touring use
 •  Mild suspension upgrades
 •  Cars where ride comfort remains important

A strong choice when replacing tired original torsion bars without moving to a substantially firmer suspension setup.

Critical Fitment Exceptions:
Even if your car falls into the year ranges above, you must ensure it does not fall under these exceptions:
•  1987–1989 Porsche 911 (G50): This SKU will not fit the later G50-equipped 911s. Those models utilize a significantly longer torsion bar (approx. 26") and different spline configurations.
•  Performance Note: A 22mm bar is a standard replacement for many early Porsche models. If you are building a track-oriented 911 or a high-horsepower VW, you may require a larger diameter (24mm–26mm) to handle the increased cornering loads.

  23 mm Solid  (Performance Upgrade)

The 23 mm solid torsion bar provides a noticeable increase in rear spring rate compared with a typical 22 mm setup. It offers improved rear suspension support while remaining suitable for performance-oriented road use.

Recommended for:
 •  Fast-road Porsche 911s
 •  Weekend sports cars
 •  Mild performance builds
 •  Uprated dampers
 •  Occasional autocross or track use

Critical Fitment Exceptions:
Even if your car falls into the year ranges above, you must ensure it does not fall under these exceptions:
•  G50 Transmission Porsche 911: This part will not fit 1987–1989 Porsche 911 models equipped with the G50 transaxle, which require longer bars and have different spline counts.
•  Stiffening Note: Moving to 23mm from a stock 22mm bar provides a noticeable increase in spring rate. While excellent for spirited driving, ensure your shock absorbers are valved to handle the increased rebound speed.

  24 mm Solid  (Sport / Street Upgrade)

The 24 mm solid torsion bar moves further into performance territory, providing increased resistance to rear suspension compression and acceleration squat.

Recommended for:
•  Fast-road cars
•  Autocross
•  Occasional track use
•  Cars with uprated dampers
•  Performance suspension builds
•  Modern high-grip tyres

This is a versatile choice for owners looking for a meaningful handling upgrade while retaining road usability.

Critical Fitment Exceptions:
Even if your car falls into the year ranges above, you must ensure it does not fall under these exceptions:
•  G50 Transmission Porsche 911: This SKU is incompatible with 1987–1989 Porsche 911 models. Those vehicles utilize a longer torsion bar and different spline counts specific to the G50 transaxle.
•  Significant Stiffness Increase: A 24mm bar is roughly 40% stiffer than a stock 22mm bar. This upgrade is highly recommended for autocross or spirited street driving but may require upgraded shock valving to control the increased spring frequency.

  25 mm Solid  (Performance / Race Upgrade)

The 25 mm solid rear torsion bar provides a stronger increase in spring rate and is well suited to more serious performance road and track-day applications.

Recommended for:
•  Aggressive fast-road use
•  Track-day cars
•  Autocross
•  Higher-powered engines
•  Uprated front torsion bars
•  Performance-valved dampers

Critical Fitment Exceptions:
Even if your car falls into the year ranges above, you must ensure it does not fall under these exceptions:
•  1987–1989 Porsche 911 (G50): These bars will not fit 911 models equipped with the G50 transaxle. The G50 cars utilize longer torsion bars (~26") and a different spline count.
•  Aggressive Stiffness: A 25mm bar is significantly stiffer than the factory 22mm or 23mm bars. This upgrade will noticeably firm up the ride quality and typically requires performance-valved shock absorbers to properly manage the increased spring frequency.

  26 mm Solid  (Competition / Heavy-Duty Upgrade)

The 26 mm solid torsion bar provides substantial rear suspension support and moves the chassis setup further toward track use.

Recommended for:
•  Fast-road / track builds
•  Regular track days
•  Lightweight Porsche 911s
•  High-grip tyres
•  Cars using matched performance dampers

At this level, front and rear suspension balance becomes increasingly important.

Critical Fitment Exceptions:
Even if your car falls into the year ranges above, you must ensure it does not fall under these exceptions:
•  G50 Transmission Porsche 911: This SKU will not fit 1987–1989 Porsche 911 models. The G50-equipped cars require longer torsion bars (~26") and use a different spline configuration.
•  Extreme Stiffness Warning: A 26mm bar is roughly 95% stiffer than a factory 22mm bar. This will result in a very rigid ride quality. It is highly recommended to pair these with race-valved shock absorbers and reinforced mounting points to prevent chassis fatigue.

  27 mm Solid  (Extreme Performance Upgrade)

The 27 mm solid rear torsion bar is a performance-focused option offering strong resistance to body roll and rear-end squat.

Recommended for:
•  Track-focused cars
•  Autocross
•  Competition-inspired builds
•  Lightweight performance cars
•  High-power applications
•  Appropriately matched front torsion bars

Critical Fitment Exceptions:
Even if your car falls into the year ranges above, you must ensure it does not fall under these exceptions:
•  G50 Transmission Porsche 911: This SKU is incompatible with 1987–1989 Porsche 911 models. The G50-equipped cars utilize significantly longer torsion bars and have a different spline configuration.
•  Track-Only Stiffness Warning: A 27mm bar is over 125% stiffer than a factory 22mm bar. This results in an incredibly rigid ride. It is highly recommended for dedicated track or competition use only, as the stiffness can cause significant chassis stress and "skipping" on uneven street surfaces without professional-grade dampers.

  28 mm Solid  (Extreme Competition Upgrade)

The 28 mm solid torsion bar is a high-rate competition-oriented option. It provides significantly increased rear spring stiffness and is designed for vehicles where maximum suspension control is more important than standard road comfort.

Recommended for:
•  Dedicated track cars
•  Motorsport applications
•  Race-prepared Porsche 911s
•  High-grip tyre packages
•  Competition dampers
•  Lightweight builds

Critical Fitment Exceptions:
Even if your car falls into the year ranges above, you must ensure it does not fall under these exceptions:
•  G50 Transmission Porsche 911: This SKU is incompatible with 1987–1989 Porsche 911 models. Those vehicles utilize significantly longer torsion bars (~26") and different spline counts specific to the G50 transaxle.
•  Race-Only Stiffness: A 28mm bar is over 160% stiffer than a factory 22mm bar. This results in an incredibly rigid ride. It is recommended for dedicated track, autocross, or drag racing use only; use on street surfaces may cause excessive chassis stress without reinforced mounting points.

  29 mm Solid   (Extreme Competition Upgrade)

The 29 mm solid rear torsion bar provides a very high spring rate for serious competition-oriented suspension setups.

Recommended for:
•  Race cars
•  Motorsport
•  High-horsepower track builds
•  High-grip competition tyres
•  Cars with fully developed suspension packages

Professional chassis setup is strongly recommended with this spring rate.

Critical Fitment Exceptions:
Even if your car falls into the year ranges above, you must ensure it does not fall under these exceptions:
•  G50 Transmission Porsche 911: This SKU is incompatible with 1987–1989 Porsche 911 models. Those vehicles utilize significantly longer torsion bars (~26") and different spline counts specific to the G50 transaxle.
•  Race-Only Stiffness Warning: A 29mm bar is over 200% stiffer than a factory 22mm bar. This results in an incredibly rigid ride quality. It is strictly recommended for dedicated track, drag racing, or heavy-duty competition use; street use may cause excessive chassis stress without reinforced mounting points and specialized damping.

  30 mm Solid   (Ultimate Competition / Weight Reduction)

The 30 mm solid torsion bar is the stiffest option in this range and is intended primarily for dedicated competition applications. It provides very high resistance to suspension compression, roll and acceleration squat.

Recommended for:
•  Dedicated race cars
•  Motorsport builds
•  High-power competition Porsche 911s
•  Cars using competition dampers
•  Highly developed chassis setups
•  Applications where road comfort is not a priority

Critical Fitment Exceptions:
Even if your car falls into the year ranges above, you must ensure it does not fall under these exceptions:
•  G50 Transmission Porsche 911: This SKU is incompatible with 1987–1989 Porsche 911 models. The G50-equipped cars require longer torsion bars and have a different spline configuration.
•  Maximum Stiffness Warning: A 30mm spring rate is roughly 250% stiffer than a factory 22mm bar. Even with the weight savings of a tubular design, the ride will be extremely rigid. This setup is strictly recommended for dedicated track vehicles, heavy V8-conversion sand rails, or professional-grade drag racing only.


Why Upgrade Rear Torsion Bars?

The torsion bars are the primary springs in the classic Porsche 911 rear suspension.

Increasing their diameter raises the spring rate, which can provide:
•   Reduced body roll
•   Reduced rear-end squat under acceleration
•   Improved rear suspension control
•   More immediate chassis response
•   Greater stability during fast cornering
•   Better support for modern performance tyres
•   Improved track performance

The correct size depends heavily on the complete vehicle specification.

Solid Construction

These Sway-A-Way torsion bars use a traditional solid steel construction.

Solid torsion bars offer:
•   Proven design
•   High torsional strength
•   Excellent durability
•   Predictable spring characteristics
•   Wide range of available rates
•   Excellent value compared with tubular alternatives
•   Suitability for both road and competition applications

For customers who prioritise spring rate, durability and value rather than the weight saving of hollow bars, the solid range is an excellent choice.

Precision Manufacturing

Sway-A-Way torsion bars are manufactured to provide consistent spring performance under repeated suspension loading.

Construction features include:
•   High-strength alloy steel
•   Precision centreless grinding
•   Controlled heat treatment
•   Consistent outside diameter
•   High fatigue resistance
•   Protective powder-coated finish

These manufacturing processes help ensure predictable suspension behaviour and long service life.

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

RS11

The product you are viewing cross references to these numbers

High-performance Sway-A-Way solid front torsion bars for classic Porsche 911 models. Designed as direct replacements for the original front torsion bars, these performance bars allow you to select the front spring rate that best suits your Porsche, from a factory-style replacement through to a considerably firmer competition suspension setup.
SET OF 2, One pair is required per vehicle.

Fits:
Porsche 911: 1965 through 1989 
Porsche 912: 1965 through 1969
Porsche 930 (Turbo): 1975 through 1989 (Verify diameter requirement; some Turbos utilized larger bars for track use)

Always confirm the required torsion-bar diameter and vehicle suspension specification before ordering.

Choose from the following torsion-bar rates: 18 mm, 19 mm,  20 mm,  21 mm,  22 mm, 23 mm  24 mm, 25 mm or 26 mm.
With sizes ranging from the factory-style 19 mm rate through to the competition-focused 26 mm option, this Sway-A-Way range allows the front suspension to be tailored for standard road use, fast-road driving, track days or dedicated motorsport applications.

Product Information

The classic Porsche 911 uses torsion bars as its suspension springs. As the front suspension moves, the torsion bar twists along its axis and provides the resistance necessary to support and control the vehicle.

Increasing the torsion-bar diameter increases the spring rate, providing greater resistance to suspension movement. This can help reduce front-end dive under braking, limit body roll during cornering and provide a more immediate chassis response.

Manufactured using solid high-strength 4340 alloy steel, Sway-A-Way torsion bars are designed to withstand repeated torsional loading while providing consistent spring characteristics.

Choosing the Correct Torsion Bar Rate

 19 mm Solid (OEM Standard Diameter)

The 19 mm torsion bar is the factory-style option within the range and is ideal for owners looking to replace tired original torsion bars while maintaining near-standard suspension characteristics. Note: Engineered as a direct-fit replacement for the front independent suspension.

Recommended for:
•  Standard road cars
•  Original-specification restorations
•  Touring use
•  Cars where ride comfort is important
•  Owners seeking factory-style front suspension behaviour

This is the natural choice where maintaining the classic Porsche road feel is the priority.

Installation & Setup Notes:
•   Indexing & Ride Height: These bars utilize the factory splined ends. Correct indexing (clocking) during installation is critical to achieving the proper stance. Small adjustments at the splines result in significant changes at the wheel.
•   Grease: Always apply a high-quality Moly-based or waterproof grease to the splines before sliding the bars into the A-arms and adjustment caps to prevent future seizing and "creaking" during cornering.
•   Upgrade Path: If you are preparing your 911 for competitive autocross or track days, consider stepping up to a 21mm or 22mm bar. This 19mm bar is specifically optimized for street comfort and original factory handling dynamics.

  20 mm Solid (Performance Upgrade)

The 20 mm torsion bar provides a mild increase in front spring rate compared with the standard 19 mm setup. It offers sharper suspension response and reduced front-end movement without moving too far away from road-oriented ride characteristics. 
Spring Rate: Higher than OEM (Approximately 23% stiffer than 19mm bars) 
Note: A popular choice for Carrera models looking to sharpen front-end response or for early "long-hood" cars being prepared for rally or fast road use.

Recommended for:
•  Fast-road cars
•  Mild performance upgrades
•  Weekend sports cars
•  Uprated road suspension
•  Cars using performance dampers and tyres

A good choice for owners wanting a noticeable but relatively restrained suspension upgrade.

Installation & Performance Notes:
•  Balanced Handling: When increasing the front bar diameter to 20mm, it is highly recommended to also upgrade the rear torsion bars (typically to 26mm or 27mm) to maintain the 911’s neutral handling balance and prevent induced understeer.
•  Spline Maintenance: Thoroughly clean the female splines in the A-arms and adjustment caps. Use a high-pressure waterproof grease on the splines during assembly to prevent "popping" noises and ensure easy adjustment in the future.
•  Indexing: Because these bars use the factory spline count, small changes in indexing result in significant ride height shifts. We recommend documenting your original bar's orientation before removal.

  21 mm Solid  (Performance Upgrade)

The 21 mm torsion bar provides a more significant increase in front spring rate and is well suited to performance-oriented road and occasional track cars. Spring Rate: Stiffer than OEM (Approximately 45–50% stiffer than 19mm bars).
Note: This is a common performance upgrade for Carrera 3.2 and SC models to improve front-end bite and overall chassis responsiveness.

Recommended for:
•  Fast-road Porsche 911s
•  Road and track-day cars
•  Autocross Carrera and SC performance builds
•  Cars using uprated dampers
•  Modern high-grip tyre packages

The increased rate provides stronger resistance to front suspension compression during braking and cornering.

Installation & Performance Notes:
•  Chassis Balance: Upgrading to 21mm front bars typically requires a corresponding upgrade to the rear torsion bars (often to 27mm or 28mm) to maintain the 911's intended handling characteristics and prevent excessive understeer.
•  Shock Matching: Due to the significantly increased spring rate, factory comfort shocks will likely be under-damped. For best results, pair these with performance-valved shocks (such as Bilstein Clubman or Koni Sport).
•  Indexing: Document your factory bar indexing before removal. Because of the high spring rate, even a one-spline difference in "clocking" will result in a dramatic change in ride height.

 22 mm Solid

The 22 mm solid torsion bar moves further toward a track-focused suspension setup. It provides increased front-end support and reduced body movement, making it suitable for cars where handling response is prioritised over standard road comfort. Spring Rate: Stock Equivalent. Note: While 22mm is typically a performance diameter, this SKU is specifically manufactured to provide a factory-style ride quality.

Recommended for:
•  Aggressive fast-road use
•  Frequent track days
•  Autocross
•  Lightweight performance cars
•  Uprated dampers
•  Complementary rear torsion-bar upgrades

Installation & Setup Notes:
•  Spline Fitment: These bars utilize the factory-style splined ends. Ensure the female splines in your A-arms and adjustment caps are thoroughly cleaned and free of debris before installation.
•  Lubrication: Use a high-quality, high-pressure waterproof grease on the splines during assembly to prevent "popping" or "creaking" and to ensure easy removal in the future.
•  Indexing: Because small changes in spline "clocking" result in significant ride height shifts, document your original bar's orientation before removal to simplify the setup of your new stance. 

 23 mm Solid  (Competition Grade)

The 23 mm solid torsion bar is a substantial performance upgrade designed for aggressive road, track and competition applications. It provides considerably greater resistance to front-end dive and body roll than the factory-style 19 mm configuration. Spring Rate: Significantly higher than OEM (Approx. 110–120% stiffer than 19mm bars). Note: Ideal for 911s used in competitive track environments, autocross, or for owners who prefer a very firm, communicative chassis.

Recommended for:
•  Track-focused Porsche 911s
•  Motorsport-inspired build
•  Autocross
•  Competition applications
•  Cars using performance or competition dampers
•  High-grip tyre setup

 At this level, the complete front-to-rear suspension balance becomes particularly important.

Installation & Performance Notes:
•  Chassis Reinforcement: Because 23mm bars exert significantly more force on the chassis than factory bars, it is highly recommended to inspect—and potentially reinforce—the torsion bar mounting points and A-arm brackets.
•  System Balance: To maintain neutral handling, 23mm front bars must be paired with much stiffer rear bars (typically 30mm or 31mm). Failure to balance the rear will result in severe understeer.
•  Shock Damping: Standard or even "Sport" street shocks will be insufficient for this spring rate. Competition-valved dampers (such as Bilstein RSR or Custom Valved Koni) are necessary to control the oscillation of a 23mm bar.
•  Spline Care: Apply high-pressure waterproof grease to the splines during assembly to prevent "popping" noises and to ensure the bars do not seize in the A-arms.

  24 mm Solid

The 24 mm solid front torsion bar provides a high spring rate intended primarily for developed performance and competition suspension packages.

Recommended for:
•  Dedicated track cars
•  Competition Porsche 911s
•  Lightweight race builds
•  High-grip tyre applications
•  Cars with substantially uprated rear torsion bars
•  Competition-valved dampers

This size is most appropriate where chassis control takes priority over road comfort.

  25 mm Solid

The 25 mm solid torsion bar is a very high-rate front suspension option aimed at serious motorsport applications.

Recommended for:
•  Race-prepared Porsche 911s
•  Motorsport builds
•  High-downforce or high-grip cars
•  Competition suspension systems
•  Vehicles with appropriately matched rear spring rates

Professional suspension setup is strongly recommended at this level of spring stiffness.

  26 mm Solid

The 26 mm solid torsion bar represents the most aggressive option in this range. Designed for highly developed competition vehicles, it provides extremely high resistance to front suspension movement and should only be used as part of a properly engineered suspension package.

Recommended for:
•  Dedicated race cars
•  Motorsport applications
•  Highly developed track builds
•  Very high-grip suspension setups
•  Cars using competition-spec dampers
•  Vehicles with suitably matched rear torsion-bar rates

For typical road use, one of the smaller sizes will generally provide a more appropriate balance of suspension performance and compliance.


Why Upgrade Front Torsion Bars?

On a classic Porsche 911, the torsion bar performs the same fundamental function as a conventional coil spring. When the suspension moves, the bar twists. The resistance of the bar to this twisting movement determines the effective spring rate.

Increasing the torsion-bar diameter can provide:
•  Reduced front-end dive under braking
•  Reduced body roll Improved steering response
•  Greater suspension control
•  More immediate turn-in
•  Better support for performance tyres
•  Improved chassis response during track driving
•  Increased resistance to suspension compression

The larger the solid torsion-bar diameter, the greater the spring rate.

Solid Construction

These torsion bars use a traditional solid construction. Solid torsion bars are an excellent choice for owners who prioritise performance, durability and value over the weight saving provided by tubular alternatives.

Advantages include:
•  Proven construction
•  High torsional strength
•  Consistent spring behaviour
•  Excellent durability
•  Wide choice of spring rates
•  Competitive cost compared with hollow alternatives
•  Suitable for road and competition use

For customers primarily focused on achieving a specific spring rate rather than reducing suspension component weight, the solid Sway-A-Way range provides an excellent solution.

4340 Alloy Steel

Sway-A-Way uses high-strength 4340 alloy steel for its Porsche torsion bars. This material is particularly suitable for components subjected to repeated twisting loads because of its combination of strength and fatigue resistance.

The manufacturing process includes:
•  High-strength alloy-steel construction
•  Precision centreless grinding
•  Heat treatment
•  Shot peening
•  Controlled dimensions
•  Protective powder coating

These processes help provide predictable spring characteristics and long-term durability.

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

FS18

The product you are viewing cross references to these numbers

High-performance Sway-A-Way solid rear torsion bar set for Porsche 911 models equipped with the G50 transmission from 1987 to 1989. Available in 26 mm, 27 mm, 28 mm and 29 mm rates. Designed as a direct suspension upgrade, these solid torsion bars allow the rear spring rate of the classic Porsche 911 suspension to be increased without converting the vehicle to coil springs.
SET OF 2, One pair is required per vehicle

Fits:
Porsche 911 1987-1989 3.2L G50
Porsche 911 1978-1989 3.3L Turbo (930)

Always confirm that your vehicle uses the G50 transmission and corresponding rear suspension configuration before ordering.

Available in 26 mm, 27 mm, 28 mm and 29 mm diameters, the range provides several levels of rear suspension stiffness, from a relatively mild fast-road upgrade through to a much firmer track-focused setup.

Increasing the torsion-bar diameter raises the effective spring rate, helping reduce rear suspension movement, body roll and squat during acceleration. This can provide a more controlled and responsive chassis, particularly when combined with suitable front torsion bars, dampers, anti-roll bars and performance tyres.

The solid construction offers a straightforward, durable solution for owners looking to upgrade the suspension without the additional cost associated with lightweight hollow torsion bars.

Available Torsion Bar Rates

 26 mm Solid (performance street / light-track upgrade)

The 26 mm solid rear torsion bar is the mildest performance option in this range. It provides increased rear suspension support while remaining particularly suitable for a road-focused Porsche where improved chassis control is wanted without moving directly to a substantially stiffer competition setup.

Recommended for:
•  Performance road cars
•  Fast-road use
•  Mild suspension upgrades
•  Uprated dampers
•  Cars using modern performance tyres
•  Occasional track-day use

Installation & Performance Notes:
•  System Balance: Suspension tuning is about ratios. If you increase the rear bar size to 26mm, you should ensure your front torsion bars are matched accordingly (typically paired with 21mm or 22mm front bars) to prevent excessive oversteer.
•  Indexing and Ride Height: Setting the ride height on a 911 is done by "clocking" the splines on the torsion bar. Because the 26mm bar is stiffer than stock, the car will sit higher than it did with the factory bars if indexed at the same angle.
•  Bushings: This is the perfect time to inspect or replace your rear spring plate bushings. High-performance bars work best when paired with fresh polyurethane or Neatrix bushings to eliminate "stiction."
•  Lubrication: Clean the splines thoroughly and apply a generous amount of waterproof, anti-seize grease to both ends of the bar. This prevents the bars from "creaking" and ensures they won't seize in the tube for future adjustments.

 27 mm Solid

The 27 mm solid rear torsion bar provides a more noticeable increase in rear spring rate. It is a strong choice for drivers looking for a more responsive chassis while retaining versatility for both road and occasional circuit use.

Recommended for:
•  Fast-road Porsche 911s
•  Clubsport-style builds
•  Road and track-day cars
•  Autocross
•  Performance suspension packages
•  Cars using uprated front torsion bars and dampers

The 27 mm Sway-A-Way bar is specifically positioned as a high-performance rear suspension upgrade for Porsche 911 applications.

Technical Setup & Performance Notes:
•  Chassis Balance: A 27mm rear bar is quite stiff. It is almost always paired with 22mm front torsion bars to maintain a neutral handling balance. Pairing 27mm rears with stock small-diameter fronts may result in excessive oversteer (the tail sliding out).
•  Damping Requirements: Due to the higher spring rate, you will likely need to upgrade to "Sport" valved dampers (such as Bilstein Clubsport or custom-valved Koni) to control the faster rebound speeds of these bars.
•  Ride Quality: While still streetable, the 27mm bar will transmit more road vibration than stock. It is perfect for canyon carving and track use but may feel firm over city potholes.
•  Weight Comparison: If choosing the Tubular option, you effectively reduce "unsprung" weight. This allows the suspension to react faster to bumps, keeping the tire in better contact with the pavement compared to a heavier solid bar of the same rate. 

  28 mm Solid  (competition / heavy performance)

The 28 mm solid rear torsion bar moves further toward a dedicated performance suspension setup. The increased spring rate helps provide stronger resistance to suspension compression and body movement during aggressive cornering and acceleration.

Recommended for:
•  Aggressive fast-road use
•  Regular track days
•  Autocross
•  Lightweight performance builds
•  High-grip tyre packages
•  Cars with appropriately matched performance dampers

A 28 mm rear bar should be considered as part of the complete suspension package rather than as an isolated upgrade.

Critical Installation & Performance Notes:
•  Chassis Balance: A 28mm rear bar is extremely stiff. To avoid dangerous snap-oversteer, these must be paired with upgraded front torsion bars (typically 23mm or 24mm fronts).
•  Damping Requirements: Standard street shocks (like Bilstein HD) will be completely overwhelmed by this spring rate. You must use custom-valved racing dampers with high rebound control to prevent the car from bouncing uncontrollably over bumps.
•  Mounting & Bushings: At this performance level, factory rubber bushings will deflect excessively. We highly recommend upgrading to spherical bearings or bronze bushings to ensure the torsion bar can move freely without binding.
•  Ride Quality: This setup is very firm. While technically street-legal, it is optimized for smooth race tracks and high-speed canyon carving. You will feel every imperfection in the road surface. 

 29 mm Solid  (full competition grade)

The 29 mm solid rear torsion bar is the stiffest option in this range and is aimed primarily at more serious track and competition-oriented builds.

It provides substantial rear roll stiffness and resistance to acceleration squat, making it suitable for cars where maximum suspension control takes priority over standard road comfort.

The 29 mm solid rear bar is a competition-focused option for highly developed performance applications.

Recommended for:
•  Track-focused Porsche 911s
•  Competition builds
•  Motorsport applications
•  High-grip tyre setups
•  Lightweight race cars
•  Cars using matched competition dampers
•  Vehicles with complementary front spring rates

Critical Competition Notes:
•  Chassis Balance: A 29mm rear bar is exceptionally rigid. To prevent dangerous snap-oversteer, it is mandatory to pair these with appropriately stiff front bars (typically 23mm to 24mm).
•  Damping Requirements: Standard or "Sport" street shocks are completely insufficient for this rate. You must use professional, custom-valved racing dampers with significant rebound control to manage the energy of a 29mm bar.
•  Bushings & Bearings: We strongly recommend replacing rubber bushings with spherical bearings or high-durometer bronze bushings. Factory rubber will simply collapse under the forces transmitted by a 29mm bar, leading to unpredictable handling.
•  Ride Quality: This setup is not recommended for street use. The ride will be extremely harsh, and the high spring rate can put significant stress on factory chassis mounting points if they are not reinforced.


Why Upgrade the Rear Torsion Bars?

The classic Porsche 911 uses torsion bars as its suspension springs.

Rather than compressing like a conventional coil spring, the torsion bar twists along its axis as the wheel moves through its suspension travel.

Increasing the torsion-bar diameter increases resistance to twisting and therefore raises the suspension spring rate.

Benefits of an appropriately selected larger rear torsion bar can include:
•  Reduced body roll
•  Reduced rear-end squat during acceleration
•  Improved chassis response
•  Increased suspension control
•  Better support for modern performance tyres
•  Improved stability during fast cornering
•  More predictable suspension movement on track.

Solid Construction

 These Sway-A-Way torsion bars use a conventional solid construction.

Solid torsion bars offer several advantages:
•  Simple and proven construction
•  Excellent torsional strength
•  Consistent spring characteristics
•  Durable performance
•  Competitive pricing compared with tubular alternatives
•  Suitable for both road and competition use

For customers primarily interested in increasing spring rate rather than reducing suspension component weight, the solid-bar range offers an excellent performance solution.

Related reference numbers
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RS21

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High-performance Sway-A-Way hollow rear torsion bar set for Porsche 911 models equipped with the G50 transmission from 1987 to 1989. Available in 27 mm, 28 mm and 29 mm rates. Designed as a direct performance replacement for the original rear torsion bars, these tubular bars provide increased rear suspension control while reducing weight compared with equivalent solid torsion bars.
SET OF 2, One pair is required per vehicle

Fits:
Porsche 911 1987-1989 3.2L G50
Porsche 911 1978-1989 3.3L Turbo (930)

Always confirm that your vehicle uses the G50 transmission and corresponding rear suspension configuration before ordering.

The tubular construction is engineered so that the hollow bar provides the same effective spring rate as the equivalent solid-diameter torsion bar, while reducing the amount of material and therefore overall component weight.

Sway-A-Way torsion bars are manufactured from high-strength, heat-treated alloy steel. The bars are precision centreless ground for consistent dimensions and spring characteristics, then finished with a protective powder coating to help resist corrosion.

Available Torsion Bar Rates

 27 mm - Fast-road and occasional track use

The 27 mm tubular rear torsion bar provides a useful performance increase while remaining a sensible option for cars that see regular road use. Sway-A-Way identifies the tubular 27 mm bar as having the stiffness of an equivalent solid 27 mm torsion bar while providing a useful weight reduction.

Recommended for:
•  Fast-road Porsche 911s
•  Uprated road suspension
•  Occasional track-day us
•  Cars using uprated dampers and front torsion bars

The 27 mm option provides greater rear suspension support without immediately moving to one of the highest rates in the range.

Technical Setup & Performance Notes:
•  Unsprung Weight Benefits: Because the tubular bar is lighter, the suspension has less inertia. This allows your dampers to work more efficiently, resulting in better mechanical grip on rougher track surfaces or uneven canyon roads.
•  Matched Balancing: A 27mm rear rate is a significant jump. To maintain the 911’s famous handling balance, it is highly recommended to pair these with 21mm or 22mm front torsion bars.
•  Damping Requirements: Standard shocks may struggle with the increased "snap" of a 27mm rate. Custom-valved Bilstein or Koni dampers are recommended to properly control the rebound.
•  Spline Care: During installation, apply a generous amount of waterproof anti-seize grease to the splines. Because tubular bars are more resonant than solid ones, proper lubrication is essential to prevent "creaking" or "clunking" sounds. 

 28 mm - Fast-road / track-day performance (not recommended for off-road use)

The 28 mm tubular rear torsion bar provides a further increase in spring rate, offering stronger control of rear suspension movement during hard acceleration and cornering.

Recommended for:
•  Aggressive fast-road use
•  Road and track-day cars
•  Autocross
•  Performance builds using modern high-grip tyres
•  Cars with matched performance dampers.

This is a strong middle option for drivers wanting a more focused chassis while retaining some flexibility for road use.

 29 mm Track-focused and competition-oriented applications (not recommended for off-road use)

The 29 mm tubular rear torsion bar is the firmest of these three G50 options and is aimed at more serious performance-oriented suspension setups.

Recommended for:
•  Track-focused Porsche 911s
•  Competition-inspired builds
•  Autocross
•  Lightweight cars
•  High-grip tyre setups
•  Cars with appropriately matched front torsion bars and performance dampers

The increased rear spring rate provides greater resistance to squat and roll but should be combined with a balanced overall suspension package.

Why Upgrade the Rear Torsion Bars?

The classic Porsche 911 suspension uses torsion bars as its primary springs. As suspension load increases, the torsion bar twists along its length. The resistance to this twisting action determines the effective spring rate.

Increasing the torsion-bar rate can provide:
•  Reduced body roll
•  Reduced rear-end squat during acceleration
•  Improved suspension control
•  More immediate chassis response
•  Greater stability during fast cornering
•  Better support for high-grip modern tyres
•  Improved control during track use
•  Improved balance when combined with complementary front suspension upgrades.

The larger the effective torsion-bar diameter, the greater the spring rate.

Tubular / Hollow Construction

Sway-A-Way tubular torsion bars are designed to reduce weight without sacrificing the desired spring rate.

The internal diameter of the hollow bar is engineered so that its torsional stiffness corresponds to the stated solid-bar rate.

This means a 27 mm tubular-rate bar is designed to provide the spring characteristics associated with a 27 mm solid torsion bar, rather than simply being a hollow 27 mm tube with a significantly softer rate.

This construction provides an attractive combination of:
•  High torsional strength
•  Reduced component weight
•  Consistent spring rate
•  Durable performance
•  Motorsport-oriented engineering.

For Porsche owners looking to reduce unnecessary weight while upgrading suspension performance, the tubular design provides a useful advantage over conventional solid bars.

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

RT21

The product you are viewing cross references to these numbers

High-performance Sway-A-Way tubular rear torsion bars for the Porsche 911 1965-86, designed as a direct replacement and performance upgrade for the original rear torsion bars. Available in seven different diameters from 25 mm through 31 mm, these bars allow the rear suspension spring rate to be tailored to suit anything from a fast-road classic Porsche through to a dedicated track or competition car.
SET OF 2, One pair is required per vehicle.

Fits:
Porsche 911 / 912: 1965 through 1986 

 * Rear axle application using the 24 11/16-inch short torsion-bar configuration
 * These bars Does not fit 1987–1989 Porsche 911 models. The G50-equipped cars require longer torsion bars and have a different spline configuration.


The tubular construction provides the spring characteristics of the corresponding solid torsion-bar size while reducing unnecessary weight. Sway-A-Way specifically engineers the hollow section so the tubular version maintains the intended spring rate rather than simply producing a softer hollow bar.

Compared with an equivalent solid set, Sway-A-Way states that the tubular construction saves approximately 5 lb per pair, making these bars particularly attractive for performance-focused Porsche builds where suspension weight reduction is desirable.

Available Torsion Bar Sizes

  25 mm (Performance/Weight Reduction Upgrade)

The 25 mm tubular bar is the mildest option in this range and is well suited to performance road cars where increased rear support is desired without moving immediately to a very aggressive track-oriented spring rate.

Suitable for:
 •  Road-focused Porsche 911s
 •  Mild suspension upgrades
 •  Touring and fast-road use
 •  Cars retaining relatively compliant front suspension settings

Critical Fitment Exceptions:
Solid vs. Tubular Tuning: While a 25mm tubular bar is designed to mimic the rate of a 25mm solid bar, the reduced mass alters the suspension's harmonic frequency. It is highly recommended to pair these with high-quality, adjustable dampers to take full advantage of the weight savings.


 26 mm (Competition/Weight Reduction Upgrade)

The 26 mm tubular bar provides a noticeable increase in rear suspension stiffness and is a popular step for performance-oriented road cars.

Suitable for:
 •   Fast-road builds
 •   Uprated dampers
 •   Modern performance tyres
 •   Occasional track use Higher-powered road cars

Critical Fitment Exceptions:
Unsprung Mass Advantage: While the spring rate is identical to a solid 26mm bar, the reduced mass of the tubular design improves tire contact over ripples and bumps. To maximize this benefit, use high-quality adjustable shocks with appropriate rebound damping.

 27 mm  (Extreme Performance / Weight Reduction)

The 27 mm tubular bar moves further toward a dedicated performance suspension setup. It provides increased resistance to rear suspension compression, helping control squat during acceleration and body movement during hard cornering.

Suitable for:
 •   Fast-road / track-day cars
 •   Autocross
 •   Lightweight performance builds
 •   Cars using uprated front torsion bars and dampers

Critical Fitment Exceptions:
Competition Stiffness Warning: A 27mm spring rate is roughly 125% stiffer than a factory 22mm bar. While the tubular design reduces weight, the ride will be extremely rigid. This setup is highly recommended for track-dedicated vehicles or high-horsepower competition builds only

 28 mm  (Extreme Competition / Weight Reduction)

The 28 mm tubular bar offers a substantial increase in rear spring rate and is aimed at cars with a more developed performance suspension setup.

Suitable for:
 •   Track-day Porsche 911s
 •   Competition-inspired builds
 •   High-grip tyres
 •   Uprated dampers
 •   Higher-powered engines

Critical Fitment Exceptions:
Extreme Stiffness Warning: A 28mm spring rate is over 160% stiffer than a factory 22mm bar. Even with the weight savings of a tubular design, the ride will be incredibly rigid. This setup is strictly recommended for track-dedicated vehicles, high-horsepower competition builds, or professional autocross setups.

  29 mm  (Extreme Competition / Weight Reduction)

The 29 mm tubular bar is a serious performance option designed for cars where chassis response and rear roll control take priority over road comfort.

Suitable for:
 •   Track-focused builds
 •   Autocross
 •   Motorsport applications
 •   Lightweight competition cars
 •   Cars running suitably matched front torsion bars and dampers

Critical Fitment Exceptions
Race-Only Stiffness Warning: A 29mm spring rate is over 200% stiffer than a factory 22mm bar. Even with the weight savings of a tubular design, the ride will be incredibly rigid. This setup is strictly recommended for track-dedicated vehicles, high-horsepower competition builds, or professional autocross setups.

 30 mm  (Extreme-Duty / Race Only)

The 30 mm tubular rear torsion bar is a high-rate competition-focused option offering substantial resistance to rear body movement and acceleration squat.

Suitable for:
 •   Dedicated track cars
 •   High-horsepower applications
 •   Motorsport builds
 •   Aggressive suspension setups
 •   Cars with competition dampers and complementary front spring rates

Critical Fitment Exceptions:
Maximum Stiffness Warning: A 30mm spring rate is over 250% stiffer than a factory 22mm bar. This results in an incredibly rigid ride that is not suitable for daily street use.
Chassis Reinforcement Required: Due to the massive torque these bars exert, we highly recommend using reinforced spring plates and checking your torsion housing for structural integrity.

  31 mm  (Professional Race / Weight Reduction)

The 31 mm tubular bar is the stiffest option in this range and is intended primarily for highly developed competition suspension systems.

Suitable for:
 •   Dedicated race cars
 •   Motorsport applications
 •   High-downforce or high-grip builds
 •   Lightweight competition
 •   Porsche 911s Suspension packages using appropriately matched front spring rates and dampers

Critical Fitment Exceptions:
Maximum Rigidity Warning: A 31mm spring rate is over 290% stiffer than a factory 22mm bar. This setup is strictly for dedicated track vehicles, heavy V8-conversion sand rails, or professional-grade drag racing.
Advanced Damping Required: You must use high-end, race-valved adjustable shocks to control the energy of a 31mm bar; standard street shocks will fail to manage the rebound speed, resulting in dangerous handling.

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RT11

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Sway-A-Way torsion bars are engineered as a direct replacement for the original front torsion bars and are available in a range of rate options from 19 mm through to 24 mm, allowing the suspension setup to be matched to the intended use of the vehicle.
SET OF 2, One pair is required per vehicle.

Fits:
Porsche 911: 1965 through 1989
Porsche 912: 1965 through 1969
Porsche 930 (Turbo): 1975 through 1989

Choose from the following torsion-bar rates: 19 mm,  20 mm,  21 mm,  22 mm, 23 mm  or 24 mm.
The different rates allow the front suspension setup to be tailored to suit anything from a standard-style road car through to fast-road, autocross and competition applications.

Product Information

High-performance Sway-A-Way tubular front torsion bar set for classic Porsche 911 models. Designed as a direct replacement and performance upgrade for the factory front torsion bars, these bars allow you to select the spring rate that best matches the vehicle's intended use, suspension specification and handling requirements.

 Unlike conventional solid torsion bars, the tubular / hollow construction is designed to achieve the required torsional spring rate while reducing unnecessary component weight. This provides an excellent strength-to-weight solution for performance-focused Porsche suspension systems.

Sway-A-Way torsion bars are manufactured from high-strength 4340 alloy steel, a material widely used where excellent fatigue resistance and strength under repeated torsional loading are required.

The bars are precision manufactured, heat treated and finished for durability, helping provide a consistent spring characteristic during demanding road and track use. Sway-A-Way product information specifies centreless-ground alloy-steel construction, heat treatment and protective coating on its Porsche torsion bars.

Choosing the Correct Torsion Bar Rate

The torsion bar acts as the spring in the classic Porsche 911 suspension system.
Increasing the torsion-bar rate increases suspension stiffness.

This can provide:
•  Reduced body roll
•  Sharper steering response
•  Improved control during aggressive cornering
•  Reduced suspension movement under load
•  Better support for performance tyres
•  Improved chassis response on track.

However, increasing torsion-bar stiffness also changes ride quality and the overall balance of the chassis.

 19 mm

A softer option suited to cars where road comfort and near-standard suspension behaviour are priorities.

Ideal for:
•   Standard or lightly modified cars
•   Road use Restoration projects
•   Drivers wanting compliant suspension behaviour

 20 mm

A mild performance increase that offers a useful step toward sharper handling without moving too far away from road-oriented suspension characteristics.

Ideal for:
•   Fast-road cars
•   Uprated road suspension
•   Weekend sports cars
•   Mild performance builds

Installation & Performance Notes:
•  Balanced Handling: When upgrading the front bars to 20mm, it is highly recommended to also upgrade the rear torsion bars to maintain the 911’s neutral handling balance. Pairing 20mm front bars with 26mm or 27mm rear bars is a common "sport" configuration.
•  Indexing: These bars utilize the factory splined ends. Correct indexing (clocking) during installation is critical to achieving the proper stance. Document your original bar's orientation before removal to simplify the setup of your new ride height.
•  Maintenance: Thoroughly clean the female splines in the A-arms and adjustment caps. Apply a high-quality waterproof grease to the splines during assembly to prevent future seizing and "creaking" during cornering.


 21 mm

A more noticeable performance upgrade providing increased front-end support and reduced body movement.

Ideal for:
•  Fast-road driving
•  Autocross
•  Dual road/track use
•  Performance suspension builds

 A 21 mm effective rate represents a substantial increase in stiffness compared with a standard 19 mm front torsion-bar rate.

Performance & Installation Notes:
•  System Balance: To prevent excessive understeer, 21mm front bars should generally be paired with upgraded rear torsion bars (typically 27mm or 28mm) to keep the 911’s handling neutral.
•  Damping Requirements: Because the spring rate is significantly higher than stock, standard comfort-valved shocks may be overwhelmed. Performance-valved dampers (such as Bilstein B8 or similar) are highly recommended.
•  Spline Care: Always clean the female splines in the A-arms and adjustment caps before installation. Use high-quality waterproof grease on the splines to prevent future seizing and ensure quiet operation.

 22 mm

A performance-focused option suitable for cars using uprated dampers, tyres and complementary rear suspension upgrades.

Ideal for:
•  Aggressive fast-road use
•  Track days
•  Lightweight builds

Installation & Setup Notes
•  Weight Benefit: The tubular design reduces unsprung mass at the front of the vehicle, allowing the suspension to react more quickly to road imperfections compared to a solid bar of the same rate.
•   Spline Care: These bars feature factory-style splined ends. Ensure the female splines in the A-arms are clean and lubricated with a high-pressure waterproof grease during assembly to prevent "creaking."
•   Indexing: Due to the 22mm diameter, indexing is sensitive. Document your original bar position to ensure you can accurately set your desired ride height (factory or "Euro" spec).
 
 23 mm

A significantly stiffer option intended primarily for serious performance and competition applications.

Ideal for:
•  Track cars
•  Autocross
•  Competition builds
•  RSR-style projects
•  Cars using competition-spec dampers and rear torsion bars

The 23 mm tubular version is described by X-Sway as a competition-oriented front torsion bar with substantially increased rate over a stock 19 mm setup.

Performance & Installation Notes:
•  Balanced Setup: At a 23mm front rate, you must upgrade your rear torsion bars (typically to 30mm or 31mm) to maintain the 911’s handling balance. Using these with stock rear bars will result in severe understeer.
•   Damping Requirements: This spring rate requires aggressive damping. We recommend competition-valved struts (such as Bilstein RSR-spec or custom-valved dampers) to prevent the front end from feeling "bouncy."
•   Spline Maintenance: Clean and inspect the female splines in your A-arms and adjustment caps. Apply a high-quality waterproof grease to the splines during installation to ensure quiet operation and prevent seizing.
•   Indexing: Because these bars are so stiff, indexing is extremely sensitive. A single spline adjustment will move the ride height significantly; document your starting position carefully.

 24 mm

The stiffest option in this range, intended for highly developed suspension setups where maximum front spring control is required.

Ideal for:
•  Dedicated track cars
•  Motorsport applications
•  Lightweight competition builds
•  Cars with suitably matched rear spring rates and dampers




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FT18

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