MMX 2-Piece Floating Front Rotor Set 335x30mm for F55 / F56 / F57 MINI JCW
The MMX MINI F5X JCW 2-Piece Front Rotor set is the cleanest brake upgrade available for the Gen 3 MINI without touching caliper or rotor diameter. Matching the OEM JCW 335mm front size, it swaps the factory single-piece disc for a true floating rotor: a proprietary high-carbon iron friction ring riding on a CNC-machined 6061-T6 aluminium hat via floating bobbins. Up to 30% more thermally efficient than the OEM JCW disc, it delivers an honest, consistent pedal deep into braking events and far longer rotor life across track-day cycles.
Features
- 2-piece floating construction with floating bobbin mounting system, the ring expands freely under heat instead of warping
- Proprietary high-carbon iron rotor ring with MMX’s signature directional groove pattern for stronger initial bite
- CNC-machined 6061-T6 aircraft-specification aluminium centre hat
- Up to 30% improved cooling efficiency over the OEM JCW disc
- Plug-and-play installation, OEM caliper, hardware, and pads all retained
- 1-year manufacturer warranty against defects in materials and workmanship
MINI F5X JCW 2-Piece Front Rotor Specifications
- Dimensions: 335mm x 30mm (matches OEM JCW front diameter)
- Rotor ring: High-carbon iron with directional grooves
- Centre hat: CNC-machined 6061-T6 aluminium, floating bobbin mount
- Sold as: Left and right directional front pair
- Pads: Not included, OEM or aftermarket pads compatible
Applications
- MINI JCW: F55, F56, F57 | 2015 to present
Notes
- Discs are directional, left- and right-handed specific. Verify orientation before installation.
- This rotor matches the OEM JCW 335mm front diameter. Cooper S models with the smaller OEM front rotor (294mm or 316mm) are not direct-fit confirmed. Contact us to verify before ordering.
- F54 Clubman and F60 Countryman front fitment is not confirmed by MMX. Contact us before ordering for those chassis.
- Pair with the 325mm rear rotor conversion (MMR31-1411R) for a complete F-chassis MINI brake refresh.
Frequently Asked Questions
Will my factory caliper and pads work?
Yes. The MINI F5X JCW 2-Piece Front Rotor retains the OEM front caliper, mounting hardware, and hub, and works with OEM or aftermarket pads.
Is this larger than the stock JCW rotor?
No, it matches the OEM JCW 335mm diameter. The gains come from the floating 2-piece construction and improved cooling, not size.
What makes the floating design better on track?
The friction ring expands radially and axially on its bobbins as it heats, eliminating the warping and surface cracking that limit the OEM single-piece disc.
Are the rotors directional?
Yes, supplied as dedicated left and right units. Verify orientation before installation.
Does it fit the Cooper S?
Cooper S models with the smaller 294mm or 316mm front rotor are not direct-fit confirmed. Contact us to verify your build before ordering.
Should I upgrade the rears too?
For a complete refresh with balanced braking, pair with the MMX 325mm rear rotor conversion (MMR31-1411R).
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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