PFF5-4001GBLK – Front Radius Arm Bush Caster Adjustable – M2 M3 M4

The Powerflex PFF5-4001GBLK Front Radius Arm to Chassis Bush (Caster Adjustable) is a Black Series polyurethane upgrade designed specifically for the BMW F8X M-cars (M2 F87, M3 F80, M4 F82/F83). With caster adjust capability and maximum stiffness, this bush dramatically improves front suspension geometry, steering precision and cornering control.

SKU: PFF5-4001GBLK
Position: Front Radius Arm → Chassis Bush
Application: Black Series (Motorsport) — F8X Only

Key Features

Black Series Motorsport Polyurethane

– Highest stiffness compound from Powerflex
– Eliminates flex in front suspension under load
– Ideal for track, drift, and high-power builds

Adjustable Caster Offset

– Allows fine tuning of steering geometry
– Improves front-end grip, turn-in and tyre contact patch
– Enhances corner entry confidence

Sharper Steering & Front-End Response

– Reduced radius arm movement under load
– More consistent steering feel
– Better feedback during aggressive driving

Durable Motorsport Design

– Resistant to heat, oil and suspension additives
– Long lifespan under high-stress conditions
– Tailored for tuned and track-driven F8X M-cars

Benefits

Installing the PFF5-4001GBLK bush transforms front-end behaviour on the F8X platform — tighter steering, sharper direction changes and more confidence under load. It’s the go-to upgrade for serious M2/M3/M4 owners who demand maximum suspension precision.

Fitment

Suitable for:
– BMW M2 (F87) – 2016-2020
– BMW M3 (F80) – 2014-2018
– BMW M4 (F82/F83) – 2014-2020

SKU: PFF5-4001GBLK
Position: Front Radius Arm → Chassis Bush
Application: F8X M-cars only

Installation Notes

– Requires removal of original radius arm bush
– Press tools and geometry alignment recommended
– NVH increase expected due to Black Series stiffness
– Ideal paired with other Black Series bushes for full front-end upgrade

About Powerflex

Powerflex Black Series components are engineered for maximum performance, offering extreme stiffness, precise alignment and durability for motorsport-level use. Ideal for high-end performance BMWs.