Powerflex Black Series Rear Subframe/Cradle Mount Bush/Bushing Insert Pair for BMW 1 Series F20 F21 (2011-2019) - Polybush 95A Track/Road - Axle Carrier/Crossmember Void Filler - Fits M135i M140i - Replaces OE 33316792510

Powerflex Black Series rear cradle mount insert kit for BMW F20 F21

Unlock sharper handling, tighter rear-end control and repeatable chassis behaviour with this competition-grade polyurethane insert kit for the rear axle carrier on the BMW 1 Series F20 and F21. The Black Series compound fills the voids in the factory rubber mounts to stabilise the rear crossmember under load, improving turn-in, traction and stability through fast directional changes and hard acceleration.

We run these inserts on our own builds and the feedback from customers is consistently positive. Expect a more connected feel from the rear of the car and far better confidence on circuit and fast road without the cost or downtime of pressing out the original bushes.

Why this upgrade works

• Black Series polyurethane in 95 Shore A for precise axle location and consistent geometry control
• Insert design sits inside the OE bush voids for a straightforward fit compared with full bush replacement
• Reduces subframe movement to curb wheel hop and rear-end float, aiding traction and braking stability
• Durable, oil and abrasion resistant material that outlasts tired rubber mounts
• Ideal for circuit use, sprint events, autocross and focused fast-road setups

What you receive

• Pair of rear cradle bush inserts
• Black Series specification
• Diagram reference: 21

Fitment and references

• Vehicle: BMW 1 Series F20 and F21 rear subframe rear position
• Cross-reference OE number: 33316792510

Note: Uprated inserts can increase noise, vibration and harshness compared with new factory rubber mounts. This is a trade-off many enthusiasts accept for the improved response and stability.

Professional installation

We recommend expert fitting for best results. MJ Modifications in Warwickshire can supply and install this kit on your BMW F20 F21. For a fitting quote or advice, email info@mjmodifications.co.uk.

Proven on builds and customer cars

• Noticeably firmer rear axle location for confident corner entry and exit
• More predictable power delivery and improved rear-end stability at speed
• Cost-effective upgrade that keeps the OE bushes in place while eliminating excessive cradle movement

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