A2-186 Girodisc 2pc Rear Brake Rotors (BMW F8x M2-M3-M4) 1 "a"


A2-186 Girodisc 2pc Rear Brake Rotors (BMW F8x M2-M3-M4)


Discovery Parts is an authorized dealer for Girodisc products and one of the largest stocking dealers in the country. We ship most products same or next business day to ensure we meet your delivery deadline.


  • Fits BMW F8x M2/M3/M4 w/ Steel Brakes

This particular application is exclusively designed for M2, M3, and M4 cars equipped with blue calipers and iron rotors.

If you own an M2 Competition, please refer to our front rotors specifically designed for that model.

For vehicles equipped with carbon ceramic brakes, we offer direct replacement iron rotors.

The Girodisc system serves as a direct replacement for the original equipment (OE) disc, requiring no modifications. It can be easily bolted onto your car and works seamlessly with OE calipers. By upgrading your brakes with lightweight high-performance replacements instead of a big brake kit, you maintain your factory bias and ABS efficiency.

The central hat section of our rotor is crafted from 6061-T6 aircraft-grade aluminum sourced exclusively from the United States. The disc itself is made from our proprietary cast iron, poured and machined entirely in-house at Girodisc. Utilizing a curved vane design derived from racing technology, the rotor acts as a centrifugal pump, efficiently channeling cooling air through the disc.

Our rotor and hat employ a floating mount system, featuring 10 high-strength alloy steel drive pins manufactured by Girodisc in the USA to our precise specifications. These pins are cadmium plated for long-lasting corrosion resistance and bear the load during braking while allowing axial and radial float between the hat and disc. Secured by class 12.9 cap screws with hardened washers, the pins ensure stability. To prevent noise when cold, anti-noise spring washers are installed on the rotor side, allowing the rotor to expand with heat while eliminating rattling and noise associated with floating rotors. This float also facilitates self-centering of the rotor between the pads.

Once the Girodisc system is installed, simply replace the cast iron rotor when necessary.

Sold and priced as a pair.

Driver Gear

If you wear it to protect yourself while racing, the DiscoveryParts.com Driver Gear collection is where you'll find it!

Shop Driver Gear

Set Up & Trackside

Keep your team safe, prepared, and ready to go with the latest crew gear. Because no matter how many laps you have, how light your helmet is, what your last dyno number is, if your team does not get you to the line on time, you can not win.

Racecar Gear

If you mount it on or install it in your vehicle for track days or wheel-to-wheel racing, the DiscoveryParts Racecar Gear collection is where you'll find it!