Why upgrade to 2-piece floating BMW G8x brake rotors at the front?

The factory front BMW G8x brake rotors are 380mm drilled single-piece units that perform adequately at road pace but are susceptible to thermal stress cracking under repeated hard braking. The MMX two-piece floating design allows the disc ring to expand independently of the hat under heat, eliminating stress at the hat-to-disc junction — the location where OEM and budget aftermarket discs most commonly crack.

How do the 72 vanes 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 discs. Left- and right-hand-specific vane orientation at each front corner ensures airflow direction matches rotation for maximum heat extraction.

Are these BMW G8x brake rotors compatible with the OEM 6-piston calipers?

Yes. The MMX front rotors are direct replacements for the factory units using the OEM 6-piston front calipers on the G87 M2, G80/G81 M3, and G82/G83 M4. No caliper change is required, and they are compatible with both OEM and aftermarket brake pads.

Are matching rear rotors available?

Yes. The MMX Rear 2-Piece Floating Brake Rotors are a direct complement to these front units for a complete front-to-rear braking upgrade on the G8x M2, M3, and M4.

How do these differ from the MMX F8x front brake rotors?

The G8x front rotors are 380mm x 36mm — the same diameter as the F8x unit but 6mm thicker, matching the factory rotor thickness specification for the G-chassis M cars. Both use the same 72-vane two-piece floating construction; the G8x version is sized specifically for the G87 M2, G80/G81 M3, and G82/G83 M4 and is not interchangeable with the F8x fitment.

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Description

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

BMW G8x brake rotors front from MMX Performance are two-piece floating replacements for the factory front discs on the G87 M2, G80/G81 M3, and G82/G83 M4, engineered to address the thermal and structural limitations of the OEM 380mm drilled single-piece units under spirited and track use. At 380mm x 36mm, each rotor uses a floating bobbin mounting system that allows radial and axial expansion under heavy braking the primary cause of cracking and warping in conventional fixed-disc designs, while 72 directionally curved internal cooling 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 disc rings feature MMX’s grooved friction surface for improved pad bite and debris clearance, and left- and right-hand-specific vane orientation ensures optimal airflow direction at each front corner for maximum heat extraction. The aluminum center hats are CNC-machined from aerospace-grade 6061-T6 billet for strength and a meaningful reduction in unsprung weight. Works with the factory 6-piston front calipers and is compatible with OEM and aftermarket brake pads. Pairs with the MMX Rear 2-Piece Floating Brake Rotors for a complete front-to-rear braking upgrade.

Features

380mm x 36mm 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 front 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 6-piston front calipers and OEM or aftermarket brake pads
Pairs with MMX Rear 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 rear rotors available
Images are generic; actual product may vary

Frequently Asked Questions

Why upgrade to 2-piece floating BMW G8x brake rotors at the front? The factory front BMW G8x brake rotors are 380mm drilled single-piece units that perform adequately at road pace but are susceptible to thermal stress cracking under repeated hard braking. The MMX two-piece floating design allows the disc ring to expand independently of the hat under heat, eliminating stress at the hat-to-disc junction — the location where OEM and budget aftermarket discs most commonly crack.
How do the 72 vanes 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 discs. Left- and right-hand-specific vane orientation at each front corner ensures airflow direction matches rotation for maximum heat extraction.
Are these BMW G8x brake rotors compatible with the OEM 6-piston calipers? Yes. The MMX front rotors are direct replacements for the factory units using the OEM 6-piston front calipers on the G87 M2, G80/G81 M3, and G82/G83 M4. No caliper change is required, and they are compatible with both OEM and aftermarket brake pads.
Are matching rear rotors available? Yes. The MMX Rear 2-Piece Floating Brake Rotors are a direct complement to these front units for a complete front-to-rear braking upgrade on the G8x M2, M3, and M4.
How do these differ from the MMX F8x front brake rotors? The G8x front rotors are 380mm x 36mm — the same diameter as the F8x unit but 6mm thicker, matching the factory rotor thickness specification for the G-chassis M cars. Both use the same 72-vane two-piece floating construction; the G8x version is sized specifically for the G87 M2, G80/G81 M3, and G82/G83 M4 and is not interchangeable with the 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 Front 2-Piece Floating Brake Rotors for G8x BMW M2 / M3 / M4 [MMR30-1601-F]

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

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