Powerflex Black Series Front Radius Arm to Chassis Bushes, Caster Adjustable for BMW 4 Series F32 F33 F36 (Track Polyurethane) - PFF5-1901GBLK

Powerflex Black Caster-Adjustable Tension Strut Bush Kit for BMW 4 Series F32 F33 F36 - PFF5-1901GBLK

Transform front-end precision and stability on your BMW 4 Series with this race-focused polyurethane tension strut bush kit. Part number PFF5-1901GBLK gives on-car caster adjustment of +/- 0.75 degrees, letting you fine-tune steering feel, camber gain on lock, and straight-line stability for track days and competitive use.

Built from the Powerflex Black 95 Shore A compound and over 200 percent stiffer than the standard rubber compliance bush, these front lower wishbone rear bushes resist deflection under braking and cornering. Expect crisper turn-in, more consistent alignment, and better tyre contact across the front axle when pushing hard.

Why this upgrade

• Part number: PFF5-1901GBLK
• Fitment: BMW 4 Series F32 Coupe, F33 Convertible, F36 Gran Coupe
• Position: Front lower control arm rear bush - also known as tension strut or thrust arm bush
• Caster adjustment: +/- 0.75 degrees for geometry optimisation and steering feel
• Material: Powerflex Black Series 95A polyurethane for motorsport use
• Stiffness: Over 200 percent firmer than OEM to control wheel alignment under load
• Handling gains: Sharper response, improved feedback, enhanced mid-corner grip and braking stability
• Pack contents: 2 bushes
• Replaces OE reference: 31126855743
• Diagram reference: 1

Real results on F32 F33 F36

We run these on our own builds and they are a go-to for customers who want predictable handling and a more connected front end on circuit. The caster tweak delivers extra dynamic negative camber on turn-in, helping the tyre bite and hold a tighter line.

Who is it for

Perfect for drivers seeking a BMW F3x suspension upgrade focused on lap-time consistency and front-end accuracy: track day enthusiasts, time attack entrants, and anyone chasing a motorsport-grade front control arm bushing solution.

Search-friendly fitment terms

BMW F32 F33 F36 tension strut bush kit, thrust arm rear bush, front wishbone rear bushing, caster correction bushings, adjustable caster bush BMW 4 Series, polyurethane suspension bush kit, front LCA rear bush, handling upgrade BMW F3x, performance suspension bushes UK, Powerflex Black Series 95A, front axle poly bushes, track suspension bushings, control arm rear mount BMW 4 Series.

Non-adjustable alternative

Prefer a fixed option for the same location on the front arm. Choose PFF5-1901BLK.

Professional installation

Pressed bushes and geometry changes are best handled by specialists. Book fitting with MJ Modifications in Warwickshire and follow up with a four-wheel alignment after installation. For a quotation and availability, email info@mjmodifications.co.uk.

Notes

• Designed for track and motorsport use
• Black Series compound: 95 Shore A