MMX 2-Piece Floating Rear Rotor Set 370x24mm for G8X BMW M2 / M3 / M4
The MMX G8X M2 M3 M4 2-Piece Rear Rotor Set addresses the axle that feels the OE limits first. On a hard-driven G8X, heat builds fastest in the smaller rear discs, showing up as uneven pad wear and a soft pedal late in a session. These 370x24mm floating rotors run up to 30% cooler than OE, weigh less, and keep rear brake bias consistent session after session, so the car stays predictable exactly when you leave braking latest.
Features
- 2-piece floating disc design (rotor ring + separate hat) resists the warping and judder that affect one-piece rotors
- Up to 30% improvement in cooling efficiency versus the OE disc with larger directional cooling vanes
- Lighter than OEM, reducing unsprung and rotating mass
- J-hook style slotted face evacuates gas and pad material under heavy use
- Supplied as left- and right-handed directional units for optimized vane geometry
- Direct bolt-on, no caliper, bracket, or pad changes required
- 1-year manufacturer warranty against defects in materials and workmanship
G8X M2 M3 M4 2-Piece Rear Rotor Specifications
- Dimensions: 370mm x 24mm
- Construction: 2-piece floating (rotor ring + separate hat)
- Rotor face: Slotted (J-hook style)
- Cooling: Directional internal vanes, up to 30% more efficient than OE
- Sold as: Left and right rear pair
Applications
- BMW M2: G87 | 2023 to present
- BMW M3: G80 | 2021 to present
- BMW M4: G82, G83 | 2021 to present
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 (MMR30-1601F) for a full-axle upgrade.
- For an iron-to-CCB conversion, see the MMX carbon ceramic rear rotor (MMR30-1604R).
Frequently Asked Questions
Why upgrade the rear rotors first?
The rear discs are smaller and concentrate heat faster, so on track they typically fade before the fronts. The G8X M2 M3 M4 2-Piece Rear Rotor set keeps temperatures and rear bias consistent through long sessions.
Do these require caliper or pad changes?
No. The set bolts on to the factory iron-brake hardware with no caliper, bracket, or pad changes.
Are the rotors directional?
Yes, each pair is supplied as dedicated left- and right-handed units. Verify orientation before installation.
What is the benefit of the floating design?
The ring can expand radially and axially under heat instead of distorting, which extends pad and rotor life and keeps pedal feel consistent.
Will these fit factory CCB-equipped cars?
No. This is a direct replacement for the factory iron brake setup only.
Can I combine these with the front set?
Yes, pairing with the 380x36mm front set (MMR30-1601F) gives the full-axle upgrade with matched thermal behavior.
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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