Powerflex Caster/Castor Adjustable Front Lower Control Arm/Wishbone Rear Bush/Bushing Kit (Radius Rod/Tension/Thrust Arm to Chassis) BMW 4 Series F32 F33 F36 F3x Road Series Polyurethane PFF5-1901G – Replaces 31126855743 31126855741 31126855742

PFF5-1901G Caster-Adjustable Front Radius Arm to Chassis Bush Kit for BMW 4 Series F32 F33 F36 - Road Series

Transform the front-end feel of your BMW F3x 4 Series with this uprated bush kit. Powerflex PFF5-1901G adds on-car caster adjustment for precise geometry tuning, delivering crisper turn-in, better straight-line stability and more consistent tyre contact when you lean on the front axle. It is a direct replacement for the factory rubber items and is ideal for enthusiastic road driving where response and confidence matter.

The Road Series compound is engineered to limit unwanted deflection, so braking feel tightens up and steering accuracy improves without making your daily drive harsh. Dial in extra positive caster with the built-in offset to enhance steering self-centring and increase dynamic negative camber on lock for improved front-end bite.

Key highlights

• On-car caster adjustability - fine tune alignment for sharper response and stability
• Road Series stiffness - significantly firmer than OE rubber for better control
• Reduces compliance under load - more predictable cornering and braking
• Supplied as a pair - replaces both sides for balanced handling
• Perfect fast-road upgrade that keeps road manners intact

Technical details

• Part number: PFF5-1901G
• Adjustability: +/- 0.75 caster offset on the car
• Pack quantity: 2 bushes
• Diagram reference: 1
• Replaces OEM references: 31126855743, 31126855741, 31126855742
• Non-adjustable option: PFF5-1901

Compatibility

• BMW 4 Series F32 - Coupe
• BMW 4 Series F33 - Convertible
• BMW 4 Series F36 - Gran Coupe

Real-world results

We run these bushes on our own builds and customer feedback has been consistently positive. Expect tighter steering, improved confidence on B-roads and a more planted front end when pushing on.

Fitting and alignment

Professional installation and a proper geometry setup are strongly recommended to get the most from the caster adjustment. For fitting, alignment and advice, book with MJ Modifications in Warwickshire. Request a quote at info@mjmodifications.co.uk.

Search terms customers use

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Choose Powerflex PFF5-1901G for your BMW 4 Series and enjoy sharper steering precision, improved stability and confidence on every drive.