The MMX Performance 2-piece floating rear rotor set is a direct bolt-on upgrade for the factory rear discs on the G80 M3, G82/G83 M4 and G87 M2, provided your car came with the factory iron brake setup. It replaces the OE one-piece units with a true 2-piece floating design that runs cooler, weighs less, and resists the warping and judder that high-temperature track use can cause on stock rotors.

The 370mm x 24mm rotor rings are paired with separate hats so the ring can expand radially and axially under heat, instead of fighting against itself the way a one-piece rotor does. That floating construction is what dramatically extends pad and rotor life under repeated heavy braking, and is what allows MMX to engineer larger, more efficient directional cooling vanes inside the rotor casting, increasing cooling efficiency by up to 30% versus OE.

For G8X M-Cars driven hard, the rear axle is where you feel the OE limits first under sustained track use, heat builds up faster on the smaller rear discs, and the consequence is uneven pad wear and a soft pedal late in a session. The MMX rear pair addresses both: lower steady-state temperatures, more even pad wear, and consistent rear bias session after session.

The rotor face is slotted (J-hook style) to evacuate gas and pad material under heavy use, and each pair is supplied as left and right-handed directional units so vane geometry is always optimized to the direction of rotation. Bolt-on with no caliper, bracket, or pad changes required.

Product Details

• 2-piece floating disc design (rotor ring + separate hat)
• Dimensions: 370mm x 24mm
• Direct bolt-on replacement for OE iron rear discs
• Up to 30% cooler than OE: up to 30% improvement in cooling efficiency
• Lighter than OEM: reduces unsprung and rotating mass
• SKU MMR30-1602-R

Vehicle Applications

• BMW M2 (G87)
• BMW M3 (G80)
• BMW M4 (G82 / G83)

Related Products

• MMX Performance G8X M2 / M3 / M4 2-Piece Floating Rotor Set, Front 380x36mm (matching front axle set)
• MMX Performance G8X M2 / M3 / M4 2-Piece Floating Carbon Ceramic Rotor Conversion, Rear 370x24mm (CCB conversion alternative)

Notes

• Factory iron brakes only. Cars equipped with factory carbon ceramic brakes (CCB) cannot use this rotor as a direct bolt-on.
• Pairs with the matching 380x36mm front rotor set (MMR30-1601-F) for a full-axle upgrade.
• For an iron-to-CCB conversion, see the matching MMX Performance carbon ceramic rear rotor (MMR30-1604-R).