Why upgrade the BMW G8x brake rotors at the rear first?

The rear discs are smaller and concentrate heat faster, so on track they typically fade before the fronts. The MMX BMW G8x brake rotors rear set keeps temperatures and rear brake bias consistent through long sessions, maintaining predictable behavior exactly when braking the hardest and latest.

What is the benefit of the 2-piece floating design on these BMW G8x brake rotors?

The 2-piece floating construction separates the rotor ring from the hat, allowing the ring to expand radially and axially under heat rather than distorting. This eliminates the warping and judder that affect one-piece rotors under sustained thermal load, extending both pad and rotor life while keeping pedal feel consistent throughout a session.

Do these BMW G8x brake rotors require caliper or pad changes?

No. The set bolts directly onto the factory iron-brake hardware with no caliper, bracket, or pad changes required.

Will these BMW G8x brake rotors fit a car with factory carbon ceramic brakes?

No. This rotor set is a direct replacement for the factory iron brake setup only. For a CCB-equipped G8x, see the MMX carbon ceramic rear rotor (MMR30-1604R) linked in the Notes section.

Can I pair these with the front rotor set?

Yes. These rear BMW G8x brake rotors pair directly with the matching 380x36mm front rotor set (MMR30-1601F) for a full-axle upgrade with matched thermal behavior front and rear.

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Description

MMX 2-Piece Floating Rear Brake Rotor Set 370x24mm for G8x BMW M2, M3, and M4

BMW G8x brake rotors rear set from MMX Performance is a 370x24mm 2-piece floating upgrade for the G87 M2, G80 M3, and G82/G83 M4, addressing the axle that reaches its limits first on a hard-driven G8x. The rear discs are smaller than the fronts and concentrate heat faster, showing up as uneven pad wear, fade, and a soft pedal late in a track session before the front braking system shows any sign of stress. The BMW G8x brake rotors rear set keeps temperatures up to 30% lower than the OE disc through larger directional internal cooling vanes, reduces unsprung and rotating mass compared to the single-piece OE rotor, and maintains consistent rear brake bias session after session so the car stays predictable when you leave braking the latest. The 2-piece floating design a separate rotor ring and hat allows the ring to expand radially and axially under heat rather than distorting, eliminating the warping and judder that affect one-piece rotors under sustained thermal load. A J-hook-style slotted face evacuates gas and pad material under heavy use. Each pair is supplied as dedicated left- and right-handed directional units for optimized vane geometry. Direct bolt-on to the factory iron brake hardware; no caliper, bracket, or pad changes required.

Features

2-piece floating design (rotor ring + separate hat) resists warping and judder
Up to 30% improvement in cooling efficiency versus OE disc
Larger directional internal cooling vanes for sustained thermal management
Lighter than OEM reduces unsprung and rotating mass
J-hook style slotted face evacuates gas and pad material under heavy use
Supplied as dedicated left- and right-handed directional units
Direct bolt-on; no caliper, bracket, or pad changes required
1-year manufacturer warranty against defects in materials and workmanship

Applications

BMW M2: G87 | 2023-present
BMW M3: G80 | 2021-present
BMW M4: G82, G83 | 2021-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 BMW G8x brake rotors at the rear first? The rear discs are smaller and concentrate heat faster, so on track they typically fade before the fronts. The MMX BMW G8x brake rotors rear set keeps temperatures and rear brake bias consistent through long sessions, maintaining predictable behavior exactly when braking the hardest and latest.
What is the benefit of the 2-piece floating design on these BMW G8x brake rotors? The 2-piece floating construction separates the rotor ring from the hat, allowing the ring to expand radially and axially under heat rather than distorting. This eliminates the warping and judder that affect one-piece rotors under sustained thermal load, extending both pad and rotor life while keeping pedal feel consistent throughout a session.
Do these BMW G8x brake rotors require caliper or pad changes? No. The set bolts directly onto the factory iron-brake hardware with no caliper, bracket, or pad changes required.
Will these BMW G8x brake rotors fit a car with factory carbon ceramic brakes? No. This rotor set is a direct replacement for the factory iron brake setup only. For a CCB-equipped G8x, see the MMX carbon ceramic rear rotor (MMR30-1604R) linked in the Notes section.
Can I pair these with the front rotor set? Yes. These rear BMW G8x brake rotors pair directly with the matching 380x36mm front rotor set (MMR30-1601F) for a full-axle upgrade with matched thermal behavior front and 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 Set 370x24mm for G8X BMW M2 / M3 / M4 [MMR30-1602R]

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MMX 2-Piece Floating Rear Brake Rotor Set 370x24mm for G8x BMW M2, M3, and M4

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Applications

Notes

Frequently Asked Questions

About MMX Performance

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