MMX 2-Piece Floating Rear Rotor Conversion 325x10mm for F55 / F56 / F57 MINI JCW
The MMX MINI F5X JCW 2-Piece Rear Rotor conversion gives the Gen 3 MINI the rear-axle braking hardware it always deserved. Where the OEM rear disc is a small single-piece unit that struggles under repeated heavy braking, this kit drops in a true 325mm 2-piece floating rotor with a JCW-red caliper carrier bracket that repositions the OEM rear caliper outboard. The result is a meaningful step up in rear braking capability with no caliper change and full retention of the OEM handbrake function.
Features
- True 325mm 2-piece floating rear rotor conversion for the F5X JCW platform
- Proprietary high-carbon iron friction ring with MMX’s signature directional groove pattern
- CNC-machined 6061-T6 aerospace-grade aluminium centre hat on a floating bobbin system
- JCW-red anodised caliper carrier bracket repositions the OEM rear caliper outboard, using OE mounting hardware rather than a simple spacer
- OEM rear caliper and handbrake function fully retained, OEM or aftermarket pads compatible
- 1-year manufacturer warranty against defects in materials and workmanship
MINI F5X JCW 2-Piece Rear Rotor Specifications
- Dimensions: 325mm x 10mm
- Rotor ring: High-carbon iron with directional grooves
- Centre hat: CNC-machined 6061-T6 aluminium, floating bobbins pre-installed
- Carrier bracket: JCW-red anodised, included with hardware
- Sold as: Left and right directional rear pair (pads not included)
Applications
- MINI JCW: F55, F56 | 2015 to present
- MINI JCW: F57 | (please contact us to confirm)
Notes
- Does NOT fit electric handbrake variants of the MINI F-Series.
- Discs are directional, left- and right-handed specific. Verify orientation before installation.
- Pair with the 335mm front rotor set (MMR31-1410F) for a complete F-chassis MINI brake refresh.
Frequently Asked Questions
Do I keep my factory rear caliper?
Yes. The MINI F5X JCW 2-Piece Rear Rotor kit includes a JCW-red carrier bracket that relocates the OEM caliper outboard to suit the larger 325mm disc. The caliper itself is unchanged.
Does the handbrake still work?
Yes, full OEM handbrake function is retained on cable-handbrake cars. Electric handbrake variants are not compatible.
Why a carrier bracket instead of a spacer?
A dedicated bracket using the OE mounting hardware ensures superior alignment, strength, and performance compared to a simple spacer.
What pads do I need?
OEM or aftermarket rear pads both work, pads are sold separately.
Are the rotors directional?
Yes, supplied as dedicated left and right units with bobbins pre-installed. Verify orientation before fitting.
Can I run this without the front upgrade?
Yes, though pairing with the 335mm front set (MMR31-1410F) delivers the complete, balanced brake refresh.
About MMX Performance
MMX Performance is a UK-based specialist in performance parts for BMW and MINI vehicles, crafting high-quality upgrades that blend precision engineering, rigorous testing, and motorsport heritage. Driven by enthusiast culture, MMX designs its products in the UK, often putting them through track validation, to ensure durability, fitment accuracy, and on-road performance. Their catalog spans drivetrain components, spacers, hardware, and chassis enhancements, all tailored to elevate both the driving experience and visual appeal of BMW and MINI models.
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