Suspension Secrets Eccentric Rear Control Arm Roll Centre Correction Bushes - BMW E90 / E92 M3

Suspension Secrets Eccentric Rear Control Arm Roll Centre Correction Bushes – BMW E90 / E92 M3

Correct rear suspension geometry after lowering your BMW E90 or E92 M3 with Suspension Secrets Eccentric Rear Control Arm Roll Centre Correction Bushes.

Lowering the E9x M3 can improve handling and reduce body movement, but it also alters important suspension geometry. One of the most commonly overlooked areas is rear roll centre position.

The roll centre has a major influence on how the chassis responds during cornering. If it moves too far from its intended position after lowering, the car can become less predictable and the balance between the front and rear axles can be compromised.

Suspension Secrets Eccentric Rear Control Arm Roll Centre Correction Bushes are designed to correct this geometry by replacing the OEM solid bush in the rear hub where the rear lower control arm, or coffin arm, attaches to the upright.

Why Correct the Rear Roll Centre?

Lowering changes the angle and position of several suspension components.

This can alter the relationship between:

• Suspension arms
• Wheel hub
• Chassis
• Roll centre
• Centre of gravity

If the rear roll centre is no longer in a favourable position, the car can feel less stable and less predictable during hard cornering.

Key Benefits

Potential benefits include:

• Corrected rear roll centre
• Restored chassis balance after lowering
• Improved corner-exit traction
• Greater rear axle grip
• Increased stability at the apex
• More predictable handling
• Increased driver confidence
• Better use of a lowered suspension setup

Eccentric Offset Design

The bush uses an eccentric, or offset, design.

This allows the mounting point of the rear lower control arm to be repositioned relative to the hub.

When installed in the correct orientation, this changes the rear suspension geometry and helps restore the roll centre after the car has been lowered.

Designed for the Rear Lower Control Arm

The bush replaces the OEM solid bush located in the rear hub where the rear lower control arm, commonly referred to as the coffin arm, connects to the upright.

Its position within the suspension makes it possible to alter the control arm geometry and correct the rear roll centre without replacing the complete hub assembly.

Corrected Rear Roll Centre

The rear roll centre influences how the chassis transfers lateral load during cornering.

When lowering alters this position too much, the car may no longer respond as consistently as intended.

Correcting the roll centre can help restore more predictable rear suspension behaviour.

Restored Chassis Balance

Lowering can affect the relationship between the front and rear roll centres.

If the rear geometry is left uncorrected, the balance of the chassis can shift.

Correcting the rear roll centre helps restore a more suitable front-to-rear relationship.

This can contribute to:

• More neutral handling
• Better rear axle confidence
• Improved predictability
• More consistent behaviour at the limit

Improved Stability at the Apex

Mid-corner stability is heavily influenced by suspension geometry.

Correcting the rear roll centre can help the rear axle remain more settled as lateral loads peak through the apex.

This can make the car feel:

• More planted
• More predictable
• Easier to balance
• More confidence-inspiring

Improved Corner-Exit Traction

A more stable rear suspension platform can also help when transitioning from lateral load into acceleration.

Potential benefits include:

• Improved rear tyre loading
• Greater mechanical traction
• More predictable throttle application
• Better corner-exit confidence

Increased Rear Axle Grip

Correct suspension geometry helps the tyres operate more consistently through the corner.

By restoring the rear roll centre, the chassis can make better use of the available rear tyre grip.

Particularly Useful on Lowered Cars

These bushes are specifically relevant to E9x M3s that have been lowered.

They are particularly suitable for cars fitted with:

• Lowering springs
• Height-adjustable spring kits
• Coilovers
• Track-focused suspension setups

The more significant the change in ride height, the more important it becomes to consider the geometry that has been altered.

Track-Focused Geometry Correction

Roll centre correction is especially valuable on track cars where small geometry changes can have a noticeable effect on balance and consistency.

This upgrade is particularly suited to:

• Clubsport builds
• Trackday cars
• Semi-slick tyre setups
• Dedicated track cars
• Lowered performance builds

Works Well With Other Geometry Upgrades

These bushes complement other rear suspension components such as:

• Adjustable rear camber arms
• Adjustable rear toe arms
• Adjustable rear traction arms
• Rear upper third links
• Solid rear control arm bushes
• Solid rear subframe bushes
• Coilovers
• Performance geometry setups

Together, these components allow much greater control over the way the rear suspension behaves.

6082 T6 Aluminium Construction

Suspension Secrets uses billet aircraft-grade 6082 T6 aluminium in its suspension components.

This provides a strong and lightweight construction suitable for demanding chassis applications.

303 Stainless Steel Components

Corrosion-resistant 303 stainless steel is used where applicable to provide durability in an exposed suspension environment.

Motorsport-Spec Bearings

Suspension Secrets uses motorsport-spec Fluro rod ends and Rodoball bearings across its performance suspension range where applicable.

These components are selected for precise articulation, performance and longevity.

Designed & Manufactured in the UK

Suspension Secrets designs and manufactures its suspension components in the UK.

The roll centre correction bushes are developed specifically around the E9x M3 rear suspension geometry.

Lifetime Warranty

Suspension Secrets states that its suspension products are covered by a lifetime warranty, including the bearings.

Warranty terms and conditions should be checked before purchase.

Professional Installation Recommended

Professional installation is strongly recommended.

Because the bush is eccentric, correct orientation is essential to achieve the intended roll centre correction.

Incorrect installation could result in unsuitable geometry.

Geometry Setup Recommended

A full four-wheel alignment should be carried out after installation.

For best results, the car should also be assessed as a complete chassis setup, including:

• Ride height
• Rear camber
• Rear toe
• Front-to-rear balance
• Suspension travel

Vehicle Fitment

BMW M3 E90 / E92

Compatible models:

• BMW E90 M3 Saloon
• BMW E92 M3 Coupe

What's Included?

Each kit includes:

• Suspension Secrets Eccentric Rear Control Arm Roll Centre Correction Bushes

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