Does the handbrake still work after fitting these MINI JCW rear brake rotors?

Yes, on cable handbrake variants. Full OEM handbrake function is retained. Electric handbrake variants of the MINI F-Series are not compatible with this kit.

Why does this kit use a carrier bracket instead of a spacer?

A dedicated machined carrier bracket using the OE mounting hardware provides superior alignment, strength, and caliper positioning compared to a simple spacer. The JCW-red anodised bracket is a proper engineered solution, not a workaround.

What pads do I need for these MINI JCW rear brake rotors?

OEM or aftermarket rear pads are both compatible with the MMX MINI JCW rear brake rotors. Pads are not included and must be sourced separately.

Can I run these MINI JCW rear brake rotors without upgrading the front at the same time?

Yes, the rear conversion works standalone. For a complete, balanced brake refresh, pairing with the matching 335mm front rotor set (MMR31-1410F) is recommended for matched thermal behavior and balanced braking front to rear.

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BP PRICING DIFFERENCE

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Description

MMX 2-Piece Floating Rear Rotor Conversion 325x10mm for F55 / F56 / F57 MINI JCW

MINI JCW rear brake rotors from MMX Performance give the Gen 3 MINI the rear-axle braking hardware it always needed: a true 325mm 2-piece floating rotor conversion for the F55, F56, and F57 JCW that replaces the small single-piece OEM disc with a system capable of handling repeated heavy braking without fade or degradation. The OEM rear disc on the F5x JCW is a known limitation on a hard-driven car; the MMX MINI JCW rear brake rotors address it with a high-carbon iron friction ring using MMX’s signature directional groove pattern, mounted on a CNC-machined 6061-T6 aerospace-grade aluminum centre hat on a floating bobbin system that allows the ring to expand radially under heat rather than distorting. A JCW-red anodized caliper carrier bracket machined to use the OE mounting hardware rather than a simple spacer repositions the OEM rear caliper outboard to suit the larger 325mm diameter, with no caliper change required. The OEM cable handbrake function is fully retained; note this kit does not fit electric handbrake variants. OEM or aftermarket rear pads are compatible. Supplied as a dedicated left and right directional pair with bobbins pre-installed.

Features

True 325mm 2-piece floating rear rotor conversion for the F5x JCW platform
High-carbon iron friction ring with MMX signature directional groove pattern
CNC-machined 6061-T6 aerospace-grade aluminum center hat on floating bobbins
JCW-red anodized caliper carrier bracket uses OE mounting hardware, not a spacer
OEM rear caliper retained no caliper change required
OEM cable handbrake function fully retained
Compatible with OEM or aftermarket rear brake pads
Supplied as dedicated left and right directional pair, bobbins pre-installed
1-year manufacturer warranty against defects in materials and workmanship

Applications

MINI JCW: F55, F56 | 2015-present
MINI JCW: F57 | Contact us to confirm fitment

Notes

Does NOT fit electric handbrake variants of the MINI F-Series
Discs are directional left and right specific. Verify orientation before installation.
Pair with the 335mm front rotor set (MMR31-1410F) for a complete F-chassis MINI brake refresh.

Frequently Asked Questions

Do I keep my factory rear caliper with these MINI JCW rear brake rotors? Yes. The MMX MINI JCW rear brake rotors kit includes a JCW-red anodised carrier bracket that relocates the OEM rear caliper outboard to suit the larger 325mm disc using the OE mounting hardware. The caliper itself is unchanged and no caliper swap is required.
Does the handbrake still work after fitting these MINI JCW rear brake rotors? Yes, on cable handbrake variants. Full OEM handbrake function is retained. Electric handbrake variants of the MINI F-Series are not compatible with this kit.
Why does this kit use a carrier bracket instead of a spacer? A dedicated machined carrier bracket using the OE mounting hardware provides superior alignment, strength, and caliper positioning compared to a simple spacer. The JCW-red anodised bracket is a proper engineered solution, not a workaround.
What pads do I need for these MINI JCW rear brake rotors? OEM or aftermarket rear pads are both compatible with the MMX MINI JCW rear brake rotors. Pads are not included and must be sourced separately.
Can I run these MINI JCW rear brake rotors without upgrading the front at the same time? Yes, the rear conversion works standalone. For a complete, balanced brake refresh, pairing with the matching 335mm front rotor set (MMR31-1410F) is recommended for matched thermal behavior and balanced braking front to rear.

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.

Additional Information

The Bulletproof Automotive website contains many thousands of products purchased in multiple different currencies. All of the prices are entered manually and accurately at the time of entry. Due to the consistently fluctuating international exchange rates, at times prices may not be able to be honored at their original intended rate. We apologize for any inconvenience this may cause, unfortunately our website is unable to compensate dynamically for what can at times be volatile changes in the cost of items due to currency values fluctuating, changes in prices from suppliers, changes in shipping and import duties, and other factors. Rest assured that any order you place on line will be at zero risk to you in this area. If in the event your order cannot be fulfilled at the original intended website price we will offer you a 100% refund, no questions asked. We will continue to do our best to maintain updated prices and we will always continue to offer our price match guarantees as well to ensure our prices are always the best for you. In short, prices may change without notice. It is always advised to give us a call prior to placing your order online to confirm availability and to confirm current pricing.

Shipping Policy

Items that are in stock in the US, either at Bulletproof’s warehouse or at a supplier’s warehouse, are generally delivered within 7-10 days. Special order items from overseas take considerably longer. As a courtesy Bulletproof offers delivery estimates to our customers which take into consideration manufacturer availability and shipping schedule. These estimates represent our best guess based on previous orders from the manufacturer and do not in any way imply a guaranteed delivery window. Many manufacturers work in a “just in time” inventory system and often take 2-20+ weeks to produce an item once an order is submitted. All deliverable items are then sent to our Japanese warehouse. Bulletproof ships a minimum of one full ocean freight container every month from Japan, oftentimes more than one a month. Ocean freight takes an average of 4 weeks. Typically it breaks down to one week in Japan for paperwork and customs, two weeks by boat and one week in US customs/clearance. Due to the wide number of variables between manufacturer and shipping schedules, delivery estimates are simply just that – estimates. We attempt to estimate conservatively and we usually deliver faster than our estimates suggest. It is not Bulletproof’s policy to guarantee delivery time of any special order item, this is impossible for us to do. By ordering you acknowledge that there is no required delivery ETA and an order may not be canceled or altered due to manufacturing or shipping delays, all ETA’s are provided as a best guess only. Please review the full Terms & Conditions here.

BP Pricing Difference

We do pricing a little differently on our JDM brands and we believe in making things simple and clear. No hidden fees or surcharges. Every price you see includes the shipping cost to our office in Los Angeles, California and all the associated taxes/duties/fees for bringing the products into the US. The only shipping you ever pay is from our facility in the US to your location. Be wary of resellers that don’t include the cost of international shipping in their pricing on JDM parts. While we believe we’ll always have the lowest all-in price on JDM products, we offer a price match guarantee for all authentic parts purchased from authorized dealers as well. For many international customers, it’s much more affordable to ship from the USA than from Japan directly, as the air freight and ocean freight costs are typically much less. However, for customers looking to ship directly from Japan outside of North America, or domestically in Japan, we can provide pricing specifically for that scenario. Please do not hesitate to contact us with any pricing questions or concerns. Please email us at sales@bulletproofautomotive.com with any inquiries.

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MMX 2-Piece Floating Rear Rotor Conversion 325x10mm for F55 / F56 / F57 MINI JCW [MMR31-1411R]

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MMX 2-Piece Floating Rear Rotor Conversion 325x10mm for F55 / F56 / F57 MINI JCW

Features

Applications

Notes

Frequently Asked Questions

About MMX Performance

Reviews