MMX Performance MINI F55 F56 F57 JCW 2-Piece 325mm Rear Rotors

The MMX 2-Piece 325mm Rear Rotor Conversion is a direct bolt-on rear-axle upgrade for MINI Gen 3 F55, F56, and F57 JCW models. Where the OEM rear disc is a small single-piece unit that struggles under repeated heavy braking, this conversion drops in a true 2-piece floating rotor, paired with a JCW-red caliper carrier bracket that repositions the OEM rear caliper outboard to suit the larger 325mm disc. The result is a meaningful step up in rear-axle braking capability without changing calipers or losing the OEM hand-brake function.

The friction ring is a proprietary high-carbon iron compound paired with a CNC-machined 6061-T6 aerospace-grade aluminium centre hat, connected by a floating bobbin system. That mount allows full thermal expansion as the rotor heats, eliminating warping and surface cracking. MMX's signature directional groove pattern is machined across the friction face for stronger initial bite and clean pad-rotor interface under load.

The kit ships complete, left- and right-handed rotors, floating bobbins pre-installed, the JCW-red anodised caliper carrier bracket, and all required fitting hardware. The OEM rear caliper is retained. OEM or aftermarket rear pads can be used. Match this to the MMR31-1410F front 335×30mm set for a complete F-chassis MINI brake refresh.

Product Details

• Diameter × thickness: 325mm × 10mm
• 2-piece floating construction with floating bobbin mounting system
• Proprietary high-carbon iron rotor ring with directional grooves
• 6061-T6 aerospace-grade aluminium centre hat (CNC-machined)
• JCW-red anodised caliper carrier bracket included: relocates OEM rear caliper outboard for 325mm fitment
• SKU: MMR31-1411R

What's Included

• 1× pair of 2-piece floating rear rotors (left + right directional, 325mm × 10mm)
• Rear caliper carrier brackets: JCW-red anodised finish
• Floating bobbins pre-assembled
• All required fitting hardware
• Brake pads not included: sold separately

Vehicle Applications

• MINI F55/F56 JCW

Related Products

• MMX MINI F-Chassis 2-Piece Floating Front Rotor 335×30mm

Notes

• MINI F57 JCW: Cabriolet (please contact us to confirm collection page)
• Discs are directional: left- and right-handed specific. Verify orientation before installation.
• Sold as a pair. Pair with MMR31-1410F front rotor set for a complete F-chassis MINI brake refresh.
• Please note: our rear 2-piece discs/rotors for the MINI F-Series does not fit the electric handbrake variants. Our rear kit includes a dedicated carrier bracket using the OE mounting hardware rather than a simple spacer to ensure superior alignment, strength, and performance.
• Includes a 1-year manufacturer warranty against defects in materials and workmanship
• Designed and tested in the United Kingdom