Suspension Secrets Adjustable Rear Billet Traction Arms - BMW 1M

Suspension Secrets Adjustable Rear Billet Traction Arms – BMW 1M

Improve rear-end traction, stability and throttle response on your BMW E82 1M with Suspension Secrets Adjustable Rear Billet Traction Arms.

Designed and manufactured in the UK, these rear traction arms replace the standard folded-steel BMW arms with a stronger, solid-mounted and adjustable billet design developed to reduce unwanted suspension flex and improve rear axle control under acceleration.

Improved Traction Under Acceleration

The rear traction arms play an important role in controlling the position and movement of the rear wheel as load is transferred through the suspension.

The standard BMW arms can flex under hard acceleration. Suspension Secrets designed these billet replacements to provide a more rigid connection, helping the rear suspension geometry remain more consistent when the car is driven hard.

Potential benefits include:

• Improved acceleration traction
• Increased straight-line stability
• More responsive rear axle behaviour
• Improved corner-exit traction
• Greater confidence when applying throttle
• More consistent rear suspension geometry

Reduced Unwanted Suspension Flex

The Suspension Secrets arms use a solid-mounted design rather than the more compliant factory arrangement.

Reducing movement within the arm helps prevent unwanted geometry changes as load is applied through the rear axle.

This can make the car respond more directly to throttle inputs and provide a more predictable rear-end feel during acceleration and corner exit.

Adjustable Rear Axle Kinematics

Unlike the non-adjustable factory arms, these Suspension Secrets traction arms provide two fixed length configurations using the supplied shim kits.

The kit includes:

• OEM-position shim configuration
• Increased-length track configuration

This allows the rear suspension geometry to be configured around how the car is being used.

OEM Position

The standard shim position retains an arm length corresponding to the OEM mounting geometry.

This is suitable for drivers who want the strength, precision and reduced compliance of the billet arm while retaining the standard rear suspension kinematics.

Track / Increased Traction Position

The second shim configuration increases the effective arm length and alters the rear axle kinematics.

Suspension Secrets developed this position specifically to increase mechanical traction under compression, such as when applying throttle on corner exit.

Changing the arm length alters the path through which the rear suspension moves, helping load the tyre differently as the suspension compresses.

This makes the increased-length configuration particularly suited to:

• Track days
• Motorsport
• Higher-power cars
• Higher-grip tyres
• Drivers prioritising corner-exit traction

Improved Corner Exit Performance

Under acceleration out of a corner, weight transfers towards the rear axle while the suspension compresses.

The track-position geometry is designed to make more effective use of this movement, increasing mechanical grip at the tyre during throttle application.

This can help provide:

• Improved traction when accelerating out of corners
• More confidence applying throttle earlier
• Greater rear axle stability
• More predictable power delivery

The exact benefit will depend on the complete suspension geometry, tyres, differential setup and available grip.

Solid-Mounted Construction

The solid-mounted design reduces the compliance present in the original rear traction arms.

Potential benefits include:

• More immediate rear axle response
• Reduced unwanted toe movement
• More consistent geometry under load
• Improved feedback
• Greater chassis precision

As with any solid or spherical-bearing suspension component, some additional mechanical feedback may be noticeable compared with an entirely rubber-mounted factory component.

Motorsport-Spec Fluro Bearings

Suspension Secrets uses motorsport-spec Fluro bearings within the arm assembly.

These are selected to provide precise articulation while minimising unwanted compliance.

Benefits include:

• Accurate suspension movement
• Reduced unwanted flex
• High load capability
• Improved geometry consistency
• Suitability for road and track use

Billet Aluminium Construction

The arms are manufactured using high-quality materials chosen for strength, durability and corrosion resistance.

Construction includes:

• Billet 6082 T6 aircraft-grade aluminium
• Corrosion-resistant stainless-steel components
• Motorsport-spec Fluro bearings

Suspension Secrets designs and manufactures its products in the UK.

Key Benefits

• Improved rear traction
• Increased straight-line stability
• More responsive rear axle to throttle inputs
• Improved corner-exit traction
• Reduced unwanted suspension flex
• Reduced unwanted toe change under load
• Adjustable rear suspension kinematics
• OEM-length configuration
• Increased-length track configuration
• Two shim kits included
• Solid-mounted construction
• Motorsport-spec Fluro bearings
• Billet 6082 T6 aluminium construction
• Corrosion-resistant stainless-steel components
• Designed and manufactured in the UK

Road & Track Setup Options

The two-position design makes these arms suitable for both road and track-focused BMW 1M builds.

For road and fast-road use, the OEM-position configuration retains the standard kinematic position while benefiting from the increased rigidity of the billet arm.

For more focused track use, the increased-length shim configuration can be used to alter the rear axle kinematics and further prioritise traction.

Vehicle Fitment

Designed for:

• BMW E82 1M Coupe

If you are unsure whether these arms are suitable for your suspension or geometry setup, please contact The Rosso Corsa Collective before ordering.

Professional Installation & Geometry Setup Recommended

Professional installation is strongly recommended.

Because these arms can alter the rear suspension geometry and kinematics, a full four-wheel geometry setup should be carried out following installation.

If changing between the OEM and increased-length track configurations, the vehicle geometry should be checked again to ensure the rear axle remains correctly configured.

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