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Solid Rear Torsion Bars. Porsche 924 / 944 - RS12
RS12
Vehicle Group
- Porsche 924 2.0L 1976-79
- Porsche 924 2.0L 1980-85
- Porsche 924 Turbo 2.0L 1979-81
- Porsche 924 Turbo 2.0L 1982-84
- Porsche 924 Carrera GT 2.0L 1981
- Porsche 924 Carrera GTS 2.0L 1982
- Porsche 924S 2.5L 1986-87
- Porsche 924S 2.5L 1988
- Porsche 944 2.5L 8V 1982-87
- Porsche 944 2.7L 8V 1988-89
- Porsche 944S 2.5L 16V 1987-88
- Porsche 944S2 3.0L 16V 1989-91
- Porsche 944 Turbo 2.5L 8V 1985-88
- Porsche 944 Turbo 2.5L 8V 1989-91
- Porsche 944 Turbo S 2.5L 8V 1988
Information
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
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
311511115D
311511116D
94433311500
94433311600
94433311501
94433311601
95133310330
95133310430
The product you are viewing cross references to these numbers
Prices from: £386.84