Powerflex Adjustable Caster Front Lower Control Arm/Radius Arm Bush Kit for BMW 3 Series G20 G21 (2018+) - Tension Strut/Thrust Arm Polyurethane Bushings - Caster Correction +/-0.75 - PFF5-2501G

Sharper steering, precise alignment and a proven upgrade for BMW 3 Series G20 and G21

Unlock front end precision and dial in your chassis with this caster-tuning front arm bushing set for the BMW 3 Series G20 saloon and G21 Touring from 2018 onwards. Designed for enthusiasts who want crisper response and stability, this uprated solution lets you fine tune caster on the car by +/- 0.75, helping you set the car up for fast road or track, counter road crown pull and enhance straight-line stability under braking.

Compared with tired factory rubber, the high-performance polyurethane construction resists deflection, keeps geometry consistent and delivers a more connected feel through the wheel. We have fitted these ourselves and customer feedback has been excellent, with noticeably tighter turn-in and more confidence mid-corner.

• On-car caster adjustment of +/- 0.75 for fine control of front axle geometry
• Improves steering precision, cornering stability and braking confidence
• Durable polyurethane bushings resist flex and wear for long-term performance
• Ideal for fast road, spirited driving and track day alignment optimisation
• Direct replacement for the front tension strut or thrust arm location

Part number: PFF5-2501G

Diagram reference: 1

Pack contents: 2 bushes

OE cross-references: 31106894667, 31106894668

Compatibility and location

Front axle control arm position on BMW 3 Series G20 and G21 models from 2018 onwards. Often referred to as the tension strut, thrust arm or radius rod bush.

Why choose this upgrade

If you are experiencing uneven steering effort, tramlining or pull, or you want to increase front end bite without resorting to harsher springs, this adjustable caster solution lets you set your alignment where you want it. It is a smart suspension refresh and a performance upgrade in one.

Professional fitting

Installation and alignment are key to getting the best from this kit. We offer in-house fitting and setup at MJ Modifications in Warwickshire. Request a quote at info@mjmodifications.co.uk.

Search-friendly fitment terms

BMW G20 G21 front control arm bush upgrade, caster correction kit, thrust arm poly bush, tension strut bushing, wishbone bush BMW 3 Series, alignment bushings, suspension bush upgrade, performance polyurethane bushings, handling upgrade for BMW 3 Series 2018 on, front axle geometry correction.