MMX G8x BMW Front Control Arm Spherical Bushings

MMX Front Control Arm Spherical Bushings – BMW G87 M2, G80/G81 M3 & G82/G83 M4

Sharpen the front-end response of your BMW G8X M car with the MMX Front Control Arm Spherical Bushings.

Designed for the BMW G87 M2, G80/G81 M3 and G82/G83 M4, these motorsport-inspired spherical bushings replace the softer factory rubber control-arm bushes with a much more precise joint designed to reduce deflection under heavy braking and cornering.

By helping maintain more consistent front wheel alignment under load, the MMX spherical bushings can improve steering response, turn-in precision, stability and tyre behaviour on both fast-road and track-focused builds.

Why Upgrade the G8X Front Control Arm Bushings?

The factory BMW rubber bushings are designed to provide a balance between performance, refinement and isolation.

Under heavy braking and cornering loads, however, rubber can deflect.

That movement can allow the front suspension geometry to change dynamically, particularly toe alignment.

MMX developed its spherical bushing upgrade to reduce this unwanted movement and provide a more direct connection between the control arm and chassis.

Key Features

• MMX front control arm spherical bushing kit
• Designed for BMW G8X M cars
• Replaces the factory rubber control-arm bushings
• Helps reduce suspension deflection
• Maintains more consistent front wheel alignment under load
• Improves steering feedback
• Sharper steering response
• More precise turn-in
• Improved stability under heavy braking
• Can help maintain more consistent tyre temperatures
• Helps reduce tyre wear caused by unwanted toe change
• 7075 aluminium construction
• Stainless-steel spacers
• High-strength spherical bearings
• Supplied as a pair
• 3D-printed installation press tool included
• Professional installation recommended

MMX lists the kit under part number MMR45-1601.

Reduced Suspension Deflection

One of the main limitations of a conventional rubber suspension bushing is deflection.

As braking and cornering forces increase, the rubber can compress and move.

This can alter the position of the control arm and allow the wheel alignment to shift away from its static settings.

By replacing the rubber joint with a spherical bearing, MMX substantially reduces this movement.

This allows the suspension geometry to remain more consistent when the chassis is heavily loaded.

Maintains Front Toe Under Load

MMX specifically designed the bushings to help maintain front toe alignment during hard braking and cornering.

Toe changes at the front axle can affect:

• Steering response
• Stability
• Tyre temperatures
• Turn-in behaviour
• Tyre wear

Reducing unwanted movement can therefore make the front axle feel more predictable and connected.

Sharper Steering Response

Removing compliance from the control-arm bushing creates a more direct relationship between steering input and front-wheel movement.

Potential benefits include:

• Faster steering response
• Sharper turn-in
• More immediate front-end feedback
• Improved chassis connection
• Greater confidence during direction changes

For performance-focused drivers, this can make the G8X front end feel noticeably more precise.

Improved Stability Under Braking

Heavy braking places significant longitudinal load through the front suspension.

With soft rubber bushings, this can cause the control arms to move relative to their static position.

The MMX spherical bushings reduce this movement, helping keep the front wheels more accurately aligned during braking.

This can provide greater stability and consistency when braking hard into a corner.

Improved Tyre Performance

Maintaining more stable geometry can also benefit tyre behaviour.

MMX highlights improved tyre life and more consistent tyre temperatures as potential benefits because the front toe is less likely to move dramatically under load.

This is especially useful for cars running:

• Performance road tyres
• Semi-slick tyres
• Track-focused compounds
• Aggressive alignment settings

For track use, maintaining the intended geometry can help the tyre work more consistently throughout a session.

7075 Aluminium Construction

The MMX bushing housings are manufactured from anodised 7075 aluminium.

7075 is a high-strength aluminium alloy commonly used where low weight and high mechanical strength are both important.

MMX combines these housings with stainless-steel spacers for durability in demanding road and track environments.

High-Strength Spherical Bearing

At the centre of the assembly is a high-strength spherical bearing.

Unlike rubber, the bearing allows controlled articulation without the same level of elastic deflection.

This is what gives the suspension its more direct and precise behaviour.

MMX positions the bearing as a durable solution intended for long-term performance use.

Spherical Bushings vs OEM Rubber Bushings

The factory rubber bushings prioritise:

• Ride refinement
• Noise isolation
• Vibration reduction
• Everyday comfort

The MMX spherical bushings prioritise:

• Steering precision
• Geometry control
• Reduced deflection
• Stability under load
• Performance feedback

For a standard road car, the factory rubber setup provides excellent refinement.

For a modified fast-road or track-focused G8X, the additional precision of a spherical joint can be far more desirable.

Road Use Considerations

Spherical bearings remove much of the compliance provided by rubber.

As a result, more road texture, noise and vibration can potentially be transmitted into the chassis.

This is an inherent trade-off of replacing compliant rubber bushings with a more rigid motorsport-style bearing.

For customers prioritising maximum refinement, the factory rubber bushings may remain more suitable.

For drivers prioritising steering precision and chassis response, the MMX upgrade offers a more focused solution.

Ideal for Fast-Road Builds

The MMX bushings can work particularly well on G8X cars already upgraded with:

• Lowering springs
• Height-adjustable spring kits
• Coilovers
• Wider tyres
• Performance alignment
• Adjustable droplinks
• Anti-roll bar upgrades

Once the suspension becomes more performance focused, reducing control-arm deflection can help make better use of those additional upgrades.

Track-Day Benefits

On track, the front suspension is exposed to repeated high loads.

Hard braking, kerb use and high lateral grip can all increase the movement seen in compliant bushings.

Spherical control-arm bushings help provide a more consistent platform for:

• Braking
• Turn-in
• Mid-corner stability
• Tyre management
• Repeatable geometry

They are therefore particularly well suited to track-day and clubsport-oriented G8X builds.

Works Well with Performance Geometry

A carefully chosen alignment setup is only useful if the suspension can maintain that geometry under load.

For cars using:

• Increased negative camber
• Track-focused toe settings
• Lower ride heights
• Wider performance tyres

reducing bushing deflection helps preserve the intended alignment more effectively during aggressive driving.

Professional Installation Required

Installation requires removal of the original front control-arm bushings and pressing the new MMX components into place.

MMX states that a hydraulic press or fly press is required.

Professional fitting is therefore strongly recommended.

Installation Tool Included

MMX includes a 3D-printed press tool with the kit.

This is designed to help protect the spherical bearing during installation and reduce the risk of damage while the assembly is pressed into place.

Correct installation technique remains essential.

Four-Wheel Alignment Recommended

A full alignment should be carried out after replacing suspension bushings.

The front suspension geometry should be checked and adjusted to suit the intended use of the car.

For track-focused builds, this is also an ideal opportunity to set:

• Front toe
• Camber where adjustable
• Rear geometry
• Steering wheel alignment

BMW G87 M2

The G87 M2 is included in MMX's official fitment for the spherical control-arm bushings.

For cars running wider tyres, lowered suspension or regular track use, reducing front suspension compliance can provide a noticeable improvement in steering precision.

BMW G80 / G81 M3

The bushings are suitable for the BMW G80 M3 and G81 M3 Touring.

Both platforms benefit from strong front-end grip, and the spherical upgrade is designed to help preserve that geometry during hard braking and cornering.

BMW G82 / G83 M4

The BMW G82 M4 Coupe and G83 M4 Convertible are also supported.

For performance-oriented M4 builds, the reduction in front suspension movement can help produce a more direct, confidence-inspiring front axle.

Compatibility

Designed for applicable BMW G8X M cars including:

• BMW G87 M2 – 2023+
• BMW G80 M3 – 2021+
• BMW G81 M3 Touring – 2021+
• BMW G82 M4 – 2021+
• BMW G83 M4 Convertible – 2021+

MMX lists the product for all M-car variants within these chassis.

What's Included?

The MMX Front Control Arm Spherical Bushing Kit includes:

• 2x MMX spherical control-arm bushing assemblies
• 7075 aluminium housings
• Stainless-steel spacers
• High-strength spherical bearings
• 3D-printed installation press tool

Supplied as a pair.

Explore More BMW G8X Suspension Upgrades

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BMW G82 / G83 M4 Parts – Browse suspension and chassis upgrades for the BMW G8X M4.

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