Suspension Secrets Adjustable Rear Traction Arms / Links - BMW F22 M235i/M240i
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Suspension Secrets Adjustable Rear Traction Arms / Links – BMW F22 M235i / M240i
Improve acceleration, rear axle response and straight-line stability with Suspension Secrets Adjustable Rear Traction Arms for the BMW F22 M235i and M240i.
The factory BMW rear traction arms use compliant rubber bushes which can flex when subjected to hard acceleration. This movement allows the rear hub and wheel geometry to move dynamically, including unwanted changes to rear toe as power is transferred through the suspension.
Suspension Secrets Adjustable Rear Traction Arms replace the rubber-bushed factory components with solidly mounted, fully adjustable arms designed to reduce this unwanted movement.
The result is a more responsive rear axle, improved traction and a stronger sense of connection between throttle input and the behaviour of the car.
Why Upgrade the Rear Traction Arms?
Reducing compliance in the rear suspension becomes increasingly important as power, torque and tyre grip increase.
Potential benefits include:
- Improved acceleration
- Increased straight-line stability
- More responsive rear axle behaviour
- Reduced unwanted toe flex under throttle
- Improved traction
- More direct throttle response through the chassis
- Higher corner-exit speeds
- Greater rear suspension control
Key Features
- Designed for BMW F22 M235i and M240i
- Fully adjustable rear traction arms
- Solidly mounted construction
- Replaces rubber-bushed OEM traction arms
- Helps reduce unwanted toe change under acceleration
- Improves rear axle response
- Allows fine adjustment of rear hub behaviour
- Adjustable using a 17mm spanner
- Billet aircraft-grade 6082 T6 aluminium construction
- Corrosion-resistant stainless steel componentry
- Motorsport-spec Fluro bearings
- Designed and manufactured in the UK
The Problem With the Factory Traction Arms
The standard rear traction arms use rubber bushes to provide everyday refinement and isolate the chassis from road inputs.
Under significant acceleration forces, however, these bushes can compress and flex.
This can allow the rear wheel hub to move relative to its intended position and alter the suspension geometry dynamically.
Potential effects include:
- Reduced traction
- Unwanted rear toe change
- Delayed rear axle response
- Reduced straight-line stability
- Less predictable corner-exit behaviour
Reduced Suspension Deflection
The Suspension Secrets arms replace the compliant rubber-mounted arrangement with solidly mounted components.
Reducing this unwanted deflection helps the rear suspension maintain more consistent geometry when significant torque is applied.
This becomes particularly beneficial on tuned or high-power cars.
Reduced Toe Change Under Acceleration
Rear toe plays an important role in traction and stability.
As the standard traction arm bushes flex, the position of the rear hub can change and alter toe dynamically.
The more rigid Suspension Secrets arrangement helps reduce this movement, allowing the rear wheels to remain closer to the intended geometry under acceleration.
Improved Acceleration
Reducing bush deflection creates a more direct connection between the tyres, suspension and chassis.
Rather than some of the initial load being absorbed through rubber bush movement, the rear axle can respond more immediately when the throttle is applied.
Potential benefits include:
- More immediate acceleration response
- Better traction
- Greater rear axle feedback
- More predictable power delivery
More Responsive Rear Axle
A reduction in rubber compliance can make the rear of the car feel noticeably more connected to driver inputs.
This gives the driver a clearer sense of how the rear tyres are responding as power is applied.
For performance driving, this can make the car easier to control and more predictable close to the available traction limit.
Improved Straight-Line Stability
Keeping the rear suspension geometry more consistent during hard acceleration can help the vehicle remain more settled.
This is particularly useful for:
- Tuned M235i models
- Tuned M240i models
- High-torque builds
- Drag-oriented setups
- High-power road cars
Higher Corner-Exit Speeds
As the car transitions from cornering to acceleration, the rear suspension experiences significant combined loads.
Reducing unwanted movement helps maintain more predictable geometry during this transition.
This can allow power to be applied earlier and more confidently, potentially improving corner-exit performance.
Adjustable Rear Hub Control
The adjustable design allows the effective traction arm length to be fine-tuned.
This provides control over the way the rear hub rotates and moves as the vehicle accelerates, giving a suspension specialist another parameter when optimising rear axle behaviour.
Easy Adjustment
The Suspension Secrets Rear Traction Arms can be adjusted using a 17mm spanner.
This makes fine setup changes relatively straightforward during:
- Professional geometry setup
- Track preparation
- Workshop adjustment
- Suspension development
Ideal for Tuned M235i & M240i Models
The benefits of reducing rear suspension compliance become increasingly relevant as torque increases.
These arms are therefore particularly well suited to:
- Remapped cars
- Higher-power builds
- Upgraded turbo setups
- Track cars
- Drag and roll-racing builds
Works With Other Rear Geometry Upgrades
Adjustable traction arms can form part of a much more comprehensive rear suspension setup.
They work particularly well alongside:
- Adjustable rear toe arms
- Adjustable rear camber arms
- Adjustable rear upper third links
- Solid rear control arm bushes
- Coilovers
- Performance geometry setups
Together, these components give significantly greater control over rear suspension kinematics.
6082 T6 Aluminium Construction
Suspension Secrets manufactures its suspension components using billet aircraft-grade 6082 T6 aluminium.
This provides a combination of:
- High strength
- Low weight
- Durability
- Performance-focused construction
Corrosion-Resistant Components
Corrosion-resistant stainless steel is used throughout the relevant hardware and adjustment components.
This helps improve long-term durability in the exposed suspension environment.
Motorsport-Spec Fluro Bearings
The arms use motorsport-spec Fluro bearings for precise articulation and reliable performance under demanding loads.
These help remove the unwanted compliance associated with conventional rubber bushings.
Road, Track & Drag Applications
Suspension Secrets Adjustable Rear Traction Arms are particularly suitable for:
- Fast-road builds
- Clubsport cars
- Trackday vehicles
- Tuned road cars
- Drag builds
- High-power performance setups
NVH Considerations
Because these arms replace rubber-bushed factory components with solidly mounted, motorsport-oriented joints, some increase in noise, vibration and harshness may be possible.
This is a performance-focused upgrade intended to prioritise rear axle response and suspension precision over factory levels of refinement.
Professional Installation Recommended
Professional installation is recommended.
After fitting, the car should receive:
- Suspension inspection
- Rear geometry checks
- Rear toe adjustment
- Rear camber check
- Full wheel alignment
- Fastener checks
Geometry Setup Essential
A professional geometry setup should be carried out after installation.
The traction arm adjustment should be considered alongside:
- Rear toe
- Rear camber
- Ride height
- Tyre choice
- Vehicle power level
- Road or track use
Vehicle Fitment
BMW 2 Series F22
Compatible models:
- BMW M235i F22
- BMW M240i F22
What's Included?
Each kit includes:
- 1 pair Suspension Secrets Adjustable Rear Traction Arms / Links
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