Powerflex Black Series Caster Adjustable Front Lower Control Arm Rear Bushes for BMW 3 Series F30 F31 F34 (F3x) | Thrust Arm / Tension Strut / Radius Arm / Wishbone Polyurethane 95A Track Caster Correction Upgrade | PFF5-1901GBLK

Polyurethane Front Lower Arm Rear Bushings - Caster Adjustable - BMW 3 Series F30 F31 F34 - PFF5-1901GBLK

Unlock razor-sharp steering feel and rock-solid stability with these Powerflex Black Series caster-adjustable front lower control arm rear bushes. Part number PFF5-1901GBLK replaces the OE rubber thrust arm bush with a motorsport-grade 95A durometer compound to keep your suspension geometry locked in under hard braking, quick direction changes and high-speed cornering.

Ideal for track days and fast road driving, this upgrade adds valuable positive caster for crisper turn-in, stronger self-centering and improved straight-line confidence. If you want your F3x platform BMW to respond immediately to inputs and hold alignment under load, this is the go-to solution.

• Precision caster adjustment for sharper turn-in and better steering self-centering
• Race-focused 95A polyurethane controls arm movement for consistent geometry
• Transforms front-end response, braking stability and mid-corner confidence
• Durable, track-ready construction designed to outperform soft factory rubber
• Perfect for fast road builds, track cars and performance-focused daily drivers

Fitment and details

• Vehicle: BMW 3 Series F30 Saloon, F31 Touring, F34 Gran Turismo
• Location: Front tension strut to body - also known as front lower control arm rear bush or thrust arm bush
• Diagram reference: 2
• Quantity in pack: 2 bushes
• Replaces OE numbers: 31126852991, 31126852992
• Powerflex part number: PFF5-1901GBLK
• Series: Black Series - engineered for ultimate performance and track use

Why enthusiasts choose this upgrade

We have fitted these on our own builds and countless customer cars, and the feedback is consistently superb. Expect a tighter front end, sharper steering precision and a more planted feel on B-roads and circuits alike. Pair with a proper alignment for maximum results.

Also known as

Front lower wishbone rear bush, caster correction bushings, front thrust arm bushings, tension strut bush upgrade, polyurethane control arm bushes, BMW F30 F31 F34 suspension bushes, track day poly bushes, handling upgrade for BMW 3 Series.

Professional fitting

For best results, we recommend professional installation followed by four-wheel alignment. MJ Modifications offers in-house fitting at our Warwickshire workshop. Request a quote at info@mjmodifications.co.uk.

Buy with confidence

Shop a proven chassis upgrade that delivers immediate gains in steering feel, stability and control. If you are building a fast road car or preparing for your next track day, PFF5-1901GBLK is a standout choice for the F3x 3 Series platform.