PowerFlex Rear Upper Lateral Arm To Chassis Bushing - E8x, E9x - N52, N54, N55, M57

Product Details

In high-performance motorsport, consistency equals speed. The factory rubber inner bushings on the BMW rear upper lateral arms (wishbones) are a known weak point under racing loads. When subjected to high cornering g-forces, hard braking, or aggressive acceleration, the stock rubber deflects significantly. This unmanaged compliance alters your rear alignment dynamically mid-corner, causing unpredictable rear-end breakaway, reduced traction, and inconsistent driver feedback.

The Powerflex Black Series replaces this vague factory component with a specialized, track-ready solution. Engineered for dedicated race cars, time attack builds, and high-stress track vehicles, this bushing kit completely stabilizes the upper lateral arm’s pivot point against the chassis.

Engineered for Elite Track Performance

• 95 Shore A Compound (Black Series): Formulated from Powerflex’s hardest proprietary polyurethane compound. It is approximately 25% stiffer than standard performance bushings, engineered explicitly to deliver zero-deflection geometry retention under severe racing loads.

• Advanced Hybrid Construction: Features a cotton-reel polyurethane design paired with a stainless-steel inner sleeve and a zinc-plated, CNC-machined outer shell. This unique architecture ensures precise load distribution and smooth mechanical articulation without binding.

• Maintained Contact Patch: By neutralizing lateral arm deflection, the rear tires maintain their optimal camber and toe settings throughout the entire cornering phase, maximizing the contact patch of your racing slicks or high-performance track tires.

• Zero Maintenance Durability: Resistant to heat, track debris, grid fluids, and oil. Unlike standard rubber that degrades or tears under racing stress, these bushings are designed to survive the most arduous endurance conditions.

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