Suspension Secrets Adjustable Rear Upper Third Links Arms - BMW E90/E92 M3

Suspension Secrets Adjustable Rear Upper Third Link Arms – BMW E90 / E92 M3

Increase rear axle grip, stability and geometry flexibility with Suspension Secrets Adjustable Rear Upper Third Link Arms for the BMW E90 and E92 M3.

The factory rear upper third links are fixed-length components. When higher levels of negative rear camber are introduced using adjustable upper camber arms, these fixed links can become increasingly loaded and may place unnecessary tension through the rear suspension joints.

Suspension Secrets Adjustable Rear Upper Third Link Arms are designed to solve this issue by providing the additional adjustment required to support more aggressive rear camber settings safely and effectively.

This makes them an important upgrade for track-focused E9x M3 builds running increased rear camber, semi-slick tyres or slick tyres.

Why Upgrade the Rear Upper Third Links?

These adjustable links allow the rear suspension to accommodate a wider range of camber settings without placing unnecessary tension through the fixed factory link arrangement.

Potential benefits include:

• Wider rear camber adjustment range
• Reduced binding of suspension joints
• Improved cornering grip
• Greater rear axle stability
• Better mid-corner traction
• Improved corner-exit traction
• Increased chassis balance
• Better compatibility with track geometry
• Improved use of semi-slick and slick tyres

Key Features

• Designed for BMW E90 / E92 M3
• Adjustable rear upper third link design
• Supports increased rear camber
• Reduces unwanted tension in the suspension
• Helps reduce ball joint and bearing binding
• Allows more aggressive track geometry
• Improves rear axle stability
• Helps increase cornering grip
• Billet aircraft-grade 6082 T6 aluminium construction
• Corrosion-resistant 316 stainless steel components
• Motorsport-spec Fluro bearings
• Designed and manufactured in the UK

The Limitation of the Factory Third Links

The standard rear upper third links are non-adjustable.

This is not necessarily a problem at factory alignment settings, but it can become restrictive once significantly more negative rear camber is introduced.

As the rear camber angle is increased, the fixed-length link can be forced into a less favourable position.

This can create:

• Increased tension
• Restricted articulation
• Bearing load
• Ball joint binding
• Reduced suspension freedom

Supports Increased Rear Camber

The Suspension Secrets adjustable design allows the link length to be configured around the chosen rear camber setting.

This helps the suspension operate more naturally when more aggressive alignment is applied.

The result is greater flexibility when setting up the rear axle for:

• Fast-road use
• Clubsport driving
• Trackdays
• Semi-slick tyres
• Slick tyres

Wider Rear Camber Adjustment Range

The adjustable third links work alongside adjustable upper rear camber arms to provide a much greater usable camber range.

This allows a geometry specialist to apply more aggressive rear settings without compromising the way the other suspension joints operate.

Reduced Binding

One of the main purposes of these links is to reduce binding through the rear suspension when track-focused camber settings are used.

If the factory fixed links are forced outside their ideal operating position, ball joints and bearings can become unnecessarily loaded.

The adjustable design helps reduce this problem.

Improved Suspension Freedom

Allowing the third links to be set correctly around the final geometry helps the rear suspension articulate more freely.

This can contribute to:

• More consistent suspension movement
• Better tyre contact
• Improved rear-end predictability
• More effective use of the damper and spring

Increased Cornering Grip

More suitable rear camber helps the tyres maintain a stronger contact patch under lateral load.

When combined with correctly adjusted upper third links, the rear suspension can operate more effectively through sustained corners.

Potential benefits include:

• Increased mid-corner grip
• Better rear axle stability
• Improved confidence at the limit
• More consistent traction

Improved Mid-Corner Traction

Correct geometry helps the rear tyres remain more consistently loaded through the corner.

This can help create a more settled and predictable rear axle during longer, higher-speed corners.

Improved Corner-Exit Traction

The rear suspension also needs to remain free and consistent as throttle is applied.

Reducing binding and maintaining suitable geometry can help improve tyre contact during corner exit.

Potential benefits include:

• Better traction under power
• More stable corner exits
• Improved rear-end confidence
• More predictable throttle application

Increased Chassis Balance

Rear camber has a major influence on the balance between front and rear grip.

Being able to increase rear camber while keeping the suspension operating correctly allows the chassis to be configured more precisely.

This is particularly useful on cars that have also received increased front camber through adjustable camber plates.

Ideal for Semi-Slick & Slick Tyres

Higher-grip tyres generate greater cornering loads and often benefit from more aggressive alignment settings.

These third links become particularly useful when running:

• Semi-slick trackday tyres
• Slick tyres
• High-grip performance tyres

They help provide the geometry range required to make better use of the additional tyre grip.

Works Best With Adjustable Rear Camber Arms

These third links are especially useful when paired with adjustable rear upper camber arms.

The two components work together to provide:

• Greater rear camber range
• Reduced binding
• Improved suspension freedom
• Better geometry control

This combination is particularly relevant for track-focused E9x M3 setups.

Motorsport-Spec Fluro Bearings

Suspension Secrets uses motorsport-spec Fluro bearings to provide precise articulation and reduced unwanted compliance.

This helps maintain consistent geometry under high suspension loads.

6082 T6 Aluminium Construction

The arms are manufactured from billet aircraft-grade 6082 T6 aluminium.

This provides a strong and lightweight structure suited to demanding suspension applications.

316 Stainless Steel Components

Corrosion-resistant 316 stainless steel is used throughout the relevant hardware and adjustment components.

This helps improve durability in an exposed suspension environment.

Designed & Manufactured in the UK

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

The rear upper third links are developed specifically around the geometry requirements of the E9x M3 rear suspension.

Road & Track Applications

These adjustable links are particularly well suited to:

• Fast-road builds
• Clubsport cars
• Trackday cars
• Semi-slick tyre setups
• Dedicated track builds

NVH Considerations

Because these components use motorsport-spec bearings rather than soft rubber mounting, some increase in noise, vibration and harshness may be possible.

They are primarily intended for performance-focused setups where geometry control takes priority over factory refinement.

Professional Installation Recommended

Professional installation is strongly recommended.

The third links should be adjusted as part of the complete rear geometry setup rather than in isolation.

Geometry Setup Essential

After installation, the car should receive a full alignment.

The final setup should consider:

• Rear camber
• Rear toe
• Ride height
• Tyre specification
• Suspension travel
• Road versus track use
• Desired chassis balance

Vehicle Fitment

BMW M3 E90 / E92

Compatible models:

• BMW E90 M3 Saloon
• BMW E92 M3 Coupe

What's Included?

Each kit includes:

• 1 pair Suspension Secrets Adjustable Rear Upper Third Link Arms

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