1 1

Powerflex

Powerflex Black Series Rear Subframe Rear Bush Insert for BMW 1/2/3/4 Series F20 F21 F22 F23 F30 F31 F32 F33 F34 F36 (M135i M140i M235i M240i 335i 340i 440i) - PFR5-1921BLK - Replaces 33316792510

Powerflex Black Series Rear Subframe Rear Bush Insert for BMW 1/2/3/4 Series F20 F21 F22 F23 F30 F31 F32 F33 F34 F36 (M135i M140i M235i M240i 335i 340i 440i) - PFR5-1921BLK - Replaces 33316792510

£71.16
£71.16 £71.16
Sale Sold out
Shipping calculated at checkout.

Heads-up on cancellations & returns: if you cancel an order or return an item, you won't get back 100% of what you paid. We apply a 10% restocking fee, the outbound shipping is non-refundable, and we have to pass on Shopify / PayPal payment processing fees; these aren't returned to us when we refund you. International orders also lose on exchange-rate spread in both directions. If the original packaging is damaged or missing, a reboxing charge applies. For international orders specifically, if you refuse to pay our shipping invoice or supply a prepaid label after placing the order, the same deductions apply. We're upfront about this — please be sure of your purchase before ordering.

Powerflex Black Series rear cradle insert kit for BMW F Series performance models

Unlock sharper handling and rock solid rear end control with this motorsport grade Powerflex Black Series insert kit. Designed to locate in the voids of the factory rear carrier bush, it limits unwanted movement of the rear axle assembly for crisper turn in, improved traction and confidence under hard acceleration, braking and fast direction changes. Ideal for hard road use, track days and time attack.

Made from Powerflex Black 95 Shore A polyurethane, this race focused material keeps suspension geometry consistent when loaded, cutting axle tramp and wheel hop while enhancing stability mid corner. We run these inserts on our own builds and customer feedback has been outstanding for response, predictability and grip.

Key benefits

  • Tightens rear cradle location for a more connected chassis feel
  • Reduces movement of the rear carrier under load for repeatable alignment
  • Better traction off the line and on corner exit with less wheel hop
  • Motorsport compound for maximum control in demanding use
  • Simple insert design that works with the original rubber bush

Part details

  • Part number: PFR5-1921BLK
  • Compound: Black Series polyurethane 95A
  • Diagram reference: 21
  • Cross reference OEM: 33316792510
  • Contents: 2 x inserts. Two required per vehicle

Compatibility

Fits BMW F Series platforms with the F generation rear subframe architecture, including rear wheel drive and xDrive:

  • BMW 1 Series F20 F21 including M135i and M140i
  • BMW 2 Series F22 F23 including M235i and M240i
  • BMW 3 Series F30 F31 F34 GT including 335i and 340i plus diesel variants
  • BMW 4 Series F32 F33 F36 including 435i and 440i

Perfect search terms for buyers: BMW F20 rear cradle bush, F30 rear crossmember insert, F32 rear carrier bushing kit, F36 subframe poly bush, M135i M140i rear bush upgrade, M235i M240i handling mod, 335i 340i rear subframe insert, 440i chassis bush set.

Why this upgrade

If your F Series feels loose at the back when pressing on, these inserts are the proven fast fix. By filling the voids in the OEM rubber, the rear axle assembly is better supported without the cost or complexity of full solid bushes. Expect a firmer, more precise feel suited to enthusiasts and track day drivers.

Installation and support

Professional fitting available at MJ Modifications in Warwickshire. Email info@mjmodifications.co.uk to request a quote and booking. We can also supply a matched set of complementary cradle location inserts for the front position on the same platform if you are chasing the most consistent rear end control.

Pre dispatch fitment check

Add your UK registration or the last 7 of the VIN at checkout and we will verify compatibility before shipping.

Brand

Powerflex

View full details