Light Weight Hollow Front Torsion Bars, Tubular. Porsche 911/ 912  ❭  FT18

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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