Rear Brake Rotors (Pair), Girodisc - G20, G22, G26, G30, G12, X3, X4, Z4, Supra

• Bolt-on replacement for G20 M340i, G22/G26 M440i, G30 5-series, G12 7-series (and Alpina B7), G01 X3 M40i, G02 X4 M40i, G29 Z4 M40i, and A90/GR Supra
• 2-piece iron rotor ring with aluminum center hat
• Curved vane design improves air circulation
• Replaceable rotor ring
• Anti-rattle hardware
• All components are Made in the USA - including rotor rings
• Race-proven with over 20 years of industry expertise

Girodisc (guy-ro) rotors are made for track/race cars that need a bolt-on replacement rotor for stock calipers. Original brake discs are adequate for street use but there is room for improvement when used on the track. Two-piece rotors are standard equipment on race cars thanks to weight savings and improved cooling. The rotor has a curved inner vane configuration that works like a centrifugal pump to force air through the rotor. If you're not yet ready to jump up to a larger big brake kit, the Girodisc is the next best thing. With it's two-piece and serviceable design, you can improve on the stock braking system performance without having to commit to larger, heavier, and costlier brake kits.

Unlike imitation two-piece rotors, the Girodisc rotor friction rings are replaceable. Keep the aluminum hat and only replace the cast iron friction ring. New hardware is included with new rings. Girodisc rings are cast in the USA from their own proprietary cast iron, cadmium plated for corrosion resistance, and then painstakingly machined and balanced in the USA.

Girodisc has nearly 20 years of experience as a brake disc supplier to major international race teams and series. Originally manufacturing replacement rings for racing brake kits from Brembo, StopTech, and others, they now supply direct-replacement rotor upgrades for OEM brake systems. All material and components are sourced from the USA with Girodisc doing all of their machining in-house. While also offering other niche products, rotors are their primary product which guarantees excellent quality and satisfaction.

Price is for the pair of assembled rotors and hats.

High-performance replacement for BMW part # 34216860925 or 34208853554

M Sport note: Also fits the rear brakes for the optional M Sport brakes (blue calipers) on G20 330i, G30 530i/540i, G11/G12 740i/750i, and G29 Z4 30i.
7-series note: Some 7 Series cars came with an even larger rear rotor than this. This rotor measures 345x24, and can NOT be used to replace the larger 370x24 sized rotors.