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Description

MMX Rear 2-Piece Floating Brake Rotors for G8x BMW M2, M3, and M4

BMW G8x brake rotors rear from MMX Performance are two-piece floating replacements for the factory rear discs on the G87 M2, G80/G81 M3, and G82/G83 M4, engineered to deliver improved thermal performance, durability, and braking consistency over the OEM single-piece units. At 370mm x 24mm, each rotor uses a floating bobbin mounting system that allows radial and axial expansion under heat the primary cause of warping and cracking in conventional fixed-disc designs while 72 directionally curved internal vanes draw air in from the center and force it outward to increase cooling efficiency by up to 30% over OEM discs. The proprietary high-temperature alloy friction rings are grooved for improved pad bite and debris clearance, and left- and right-hand-specific vane orientation ensures optimal airflow direction at each rear corner. The aluminum center hats are CNC-machined from aerospace-grade 6061-T6 billet for strength and reduced unsprung weight. Compatible with OEM and aftermarket brake pads and OEM rear calipers. Pairs with the MMX Front 2-Piece Floating Brake Rotors for a complete front-to-rear braking upgrade.

Features

370mm x 24mm two-piece floating rotor design
Floating bobbin mounting system allows thermal expansion without warping or cracking
72 directionally curved internal cooling vanes increase cooling efficiency up to 30% over OEM
Left- and right-hand-specific vane orientation for optimized airflow at each rear corner
Grooved friction surface for improved pad bite and debris clearance
CNC-machined aerospace-grade 6061-T6 aluminum center hats for weight savings
Compatible with OEM and aftermarket brake pads
Fits OEM rear calipers
Pairs with MMX Front 2-Piece Floating Brake Rotors

Applications

BMW M2: G87 | 2023-present
BMW M3: G80, G81 | 2021-present
BMW M4: G82, G83 | 2021-present

Notes

Sold as a pair
Compatible with OEM or aftermarket performance pads
Matching front rotors available
Images are generic; actual product may vary

Frequently Asked Questions

What is the advantage of 2-piece floating BMW G8x brake rotors at the rear? The factory rear BMW G8x brake rotors are single-piece units susceptible to warping and cracking under repeated hard braking. The MMX two-piece floating design allows the disc ring to expand independently of the hat under heat, eliminating the thermal stress at the hat-to-disc junction that causes single-piece rotors to crack — particularly relevant on track-driven G8x M cars where rear brake temperatures rise under sustained braking.
How does the 72-vane design improve cooling on these BMW G8x brake rotors? The 72 directionally curved internal vanes draw air in from the center of the disc and force it outward through centrifugal action during braking, increasing cooling efficiency by up to 30% over the OEM rear discs. Left- and right-hand-specific vane orientation at each rear corner ensures the airflow direction is correct for maximum heat extraction.
Are these BMW G8x brake rotors compatible with OEM rear calipers and pads? Yes. The MMX rear rotors are direct replacements for the factory units using OEM rear calipers, and are compatible with both OEM brake pads and most aftermarket performance pads. No caliper change or pad change is required to fit these rotors.
Should I fit these with the MMX front rotors? Yes, where possible. Fitting upgraded rear rotors with factory front discs leaves a thermal imbalance across the axles. The MMX Front 2-Piece Floating Brake Rotors are the matched complement for a complete front-to-rear G8x braking upgrade.
How do these G8x rear rotors differ from the F8x rear rotors? The G8x rear rotors are 370mm x 24mm — the same dimensions as the F8x rear units, matching the factory rear rotor specification shared across both generations. Both use the same 72-vane two-piece floating construction. The G8x version is built to the specific tolerance and hat geometry of the G-chassis rear hub and is not interchangeable with F8x fitment.

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 and puts 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 Rear 2-Piece Floating Brake Rotors for G8x BMW M2 / M3 / M4 [MMR30-1602-R]

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MMX Rear 2-Piece Floating Brake Rotors for G8x BMW M2, M3, and M4

Features

Applications

Notes

Frequently Asked Questions

About MMX Performance

Reviews