MMX 370x24mm 2-Piece Floating Rear Brake Discs/Rotors for BMW G8x M2 M3 M4 (G87 G80 G81 G82 G83) - Grooved/Slotted, Directional 72-Vane, 6061-T6 Aluminium Hats

Rear rotor upgrade for BMW G87 M2, G80 G81 M3, G82 G83 M4

Give your G8x braking system the consistency it deserves with MMX two-piece floating rear rotors in 370 x 24 mm. Built for fast road and track days, these vented rings control heat brilliantly for repeatable stopping performance and a confident pedal on spirited drives.

Why this rear rotor set transforms your BMW

• Two-piece floating construction allows the iron ring and 6061-T6 aluminium hat to expand independently under temperature, helping to minimise the typical distortion and surface cracking seen with single-piece rears.
• Temperature management you can feel. Expect rotor temps up to thirty percent lower than factory in comparable use, so fade resistance and pad life both improve.
• 72 curved internal vanes pull air through the disc efficiently for rapid heat rejection and stable braking over repeated heavy stops.
• Left and right specific orientation for balanced airflow across the axle. No compromised universal casting here.
• Precision machined slots clean the pad face, evacuate gases and dust, and sharpen initial bite for a reassuring response at the pedal.
• Rotor ring manufactured from a purpose-formulated alloy to cope with extreme thermal loads while maintaining structural integrity.
• Works great with OE pads for daily use. For aggressive circuit driving, pair with a dedicated track compound. Compatible with most performance pad options.
• Designed to partner perfectly with MMX front replacements for a matched look and balanced braking feel.

Fitment

Direct rear fit for the BMW G8x platform:

• BMW M2 G87
• BMW M3 G80 Saloon and G81 Touring
• BMW M4 G82 Coupe and G83 Convertible

Real-world feedback

We run these on our own builds and customer cars. Owners report stronger bite, a more stable pedal after repeated heavy stops, and noticeably better heat control on B-road blasts and track sessions, with excellent durability in all weather.

Technical details

• Dimensions: 370 mm diameter x 24 mm thickness
• Type: two-piece floating rear rotor set
• Venting: 72 curved internal vanes
• Friction face: slotted for pad deglazing and gas evacuation
• Hat material: 6061-T6 aluminium
• Ring material: high-performance rotor alloy
• Handed: left and right specific
• Cooling benefit: up to 30 percent lower operating temps versus OE in comparable conditions
• Pad compatibility: OEM and aftermarket performance compounds

Installation and support

Professional fitting recommended. MJ Modifications offers installation at our Warwickshire workshop. For a fitting quote or advice, email info@mjmodifications.co.uk.

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