Spherical Bearing Bushings Eccentric Caster – BMW F20 M135i & M140i

Why Tolerate Imprecise Front Axle Behavior on Your BMW M135i/M140i?

Your BMW F20 M135i or M140i is a performance machine that deserves a chassis to match. At Optimiz Access, experts in maintenance and personalization of sports vehicles, we know that the weak link in your front axle often lies in the soft original bushings. Do not let these components compromise your driving feel.

What You Lose Without These Eccentric Spherical Bearing Bushings

Continuing to drive with worn or overly soft rubber bushings exposes you to a gradual and costly degradation of your driving experience and your vehicle: You lose road feel: Soft bushings absorb vibrations, but also crucial information about grip. The result is an unpleasant vague steering feel, especially during rapid load changes or heavy braking, causing you to lose confidence in your front end. You compromise the chassis geometry: The flexibility of the rubber allows the control arm to move under load (braking, cornering), dynamically changing the Caster and Camber angles. Without spherical bearing bushings to maintain a firm position, you lose the precision and stability for which your BMW was designed. You accelerate tire wear: When the geometry is unstable or incorrectly set (especially after lowering), the incorrect Caster angle leads to premature and irregular tire wear. These eccentric bushings allow you to correct or optimize the Caster for better wheel positioning in corners and improved tire longevity. You waste the potential of your shock absorbers: A non-rigid front end prevents your shock absorbers (whether stock or performance) from working effectively. By installing monoball bearings instead of rubber, you ensure a direct mechanical connection, transmitting the shock absorber's full potential to the road.

The Spherical Bushing Upgrade: Rigidity and Precision for BMW M Models

These spherical bearing bushings (often called monoball or spherical bearings) directly replace the original rubber mounts on your BMW F20 M135i / M140i. The metal spherical joint allows free articulation of the axis without the elastic deflection of the rubber. The eccentric design allows the pivot point of the control arm to be offset to adjust the **Caster angle**. An increased Caster angle improves straight-line stability and increases steering feedback, a crucial performance gain for track driving or **personalization**.

Frequently Asked Questions About Chassis Upgrades

Is installation difficult?

Installation requires specific press tools to extract and insert the bushings into the control arms. We strongly recommend entrusting this technical operation, which directly impacts safety and geometry, to professionals like the Optimiz Access workshop.

Do these spherical bearings generate noise?

Spherical bearing bushings offer a direct mechanical connection that may transmit more road noise and vibrations than the original soft rubber. This is the acceptable compromise for gaining precision and performance on a sports vehicle.

Do I need to have the Caster adjusted after installation on my M140i?

Yes, absolutely. The installation of eccentric parts allows for geometry modification. A complete geometry alignment is mandatory after installation to ensure maximum performance and even wear of the tires. Our workshop in the Hauts-de-France is specialized in these precise adjustments for BMW.

Fast Purchase and Expert Optimiz Access Service

Don't wait any longer to transform the feel of your BMW M135i/M140i. Order your eccentric spherical bearing bushings today. Optimiz Access ensures fast shipping worldwide. Also consider our installation and geometry adjustment service available at our premises near Lille, Arras, and Valenciennes. Consult the complementary products for your performance chassis at the bottom of this page.