Front Brake Rotors (Pair), Girodisc - G42, G20, G22, G30, G12, G15, G01, G02, G05, G29, Supra A90

Direct fit 2-piece lightweight assembled rotor for track/race use. Replaces BMW part # 34116860911 and 34116860912.

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  • Bolt-on replacement for G42 M240i, G20 M340i, G22 M440i, G30 540i, G12 740i, G15 840i, G01 X3 M40i, G02 X4 M40i, G05 X5 40i, G29 Z4 M40i, and Supra A90/GR.
  • 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 # 34116860911, 34116860912, 34108858705, and 34108858706.

BMW Fitments:
2 Series
G42 / G43 (2022+) > M240i
G42 / G43 (2022+) > M240i xDrive
3 Series
G20 (2019+) > M340i
G20 (2019+) > M340i xDrive
4 Series
G22 / G23 (2021+) > M440i
G22 / G23 (2021+) > M440i xDrive
5 Series
G30 (2017-2023) > 540i (B58A 2017-2019)
G30 (2017-2023) > 540i (B58C 2020-2023)
G30 (2017-2023) > 540i xDrive (B58A 2017-2019)
G30 (2017-2023) > 540i xDrive (B58C 2020-2023)
7 Series
G12 (2016-2023) > 740i
G12 (2016-2023) > 740i xDrive
8 Series
G14 / G15 / G16 (2019+) > 840i xDrive
X3 Series
G01 X3 (2018-2024) > X3 M40i B58A (2018-2019)
G01 X3 (2018-2024) > X3 M40i B58D (2020-2024)
X4 Series
G02 X4 (2019-2024) > X4 M40i B58A (2018-2019)
G02 X4 (2019-2024) > X4 M40i B58D (2020-2024)
X5 Series
G05 X5 (2019+) > X5 xDrive40i B58C (2019-2023)
Z Series
G29 Z4 (2019+) > Z4 M40i
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