The Powerflex PFF5-1901GBLK Front Radius Arm Bush (Caster/Camber Adjustable) is a Black Series motorsport upgrade designed for the BMW M135i, M140i, M235i and M240i. This bush replaces the OEM rubber tension-strut bush with a much stiffer polyurethane design and introduces geometry adjustability, allowing fine tuning of caster and camber for sharper turn-in, improved grip and superior front-end stability. Ideal for fast-road, track and high-power M-Lite builds.

SKU: PFF5-1901GBLK
Position: Front Radius Arm → Chassis Bush
Application: Black Series (Motorsport)

Key Features

Black Series Motorsport Polyurethane

– Hardest, most rigid compound available from Powerflex
– Provides near-solid mounting for maximum precision
– Eliminates OEM bush deflection during hard braking and cornering
– Optimal for track, drift and aggressively tuned road builds

Adjustable Geometry (Caster/Camber)

– Allows improved front-end geometry setup
– Enhances turn-in bite and steering accuracy
– Enables better tyre contact during cornering
– Reduces understeer and improves mid-corner stability

Sharper Steering Feel & Feedback

– Removes the lazy, soft feel of OEM tension-strut bushes
– Provides an immediate, predictable steering response
– Improves control during fast transitions and direction changes

Greater Braking Stability

– Reduces nose-dive and instability under heavy braking
– Keeps the suspension geometry consistent under load
– Enhances front-end confidence on spirited drives

High-Durability Motorsport Construction

– Resistant to abrasion, oil, chemicals and high temperatures
– Maintains stiffness far longer than OEM rubber
– Designed for repeated extreme load cycles

Benefits

Upgrading to the PFF5-1901GBLK bush significantly transforms the F2X/F3X M-Lite platform. You’ll experience sharper turn-in, more front-end grip, better braking stability and far more confidence when pushing the car on road or track. For drivers wanting maximum accuracy and geometry adjustability, this bush is the go-to solution.

Fitment

Suitable for:
– BMW M135i (F20/F21)
– BMW M140i (F20/F21)
– BMW M235i (F22/F23)
– BMW M240i (F22/F23)

SKU: PFF5-1901GBLK
Position: Front Radius Arm (Tension Strut) – Adjustable Bush
Recommended For: Track, drift, fast-road and high-power builds

Installation Notes

– OEM bush removal requires pressing
– Wheel alignment is essential after installation
– NVH increase expected (motorsport-grade stiffness)
– Professional installation strongly recommended

About Powerflex

Powerflex Black Series bushes are engineered for maximum stability, precision and durability under extreme motorsport conditions. They offer the highest performance of any Powerflex range, making them ideal for serious performance BMW builds.