M2/M3/M4 G8X 370mm Rear Rotor Set

The Girodisc 370mm rotor set is a direct OE replacement for G8X M2 / M3 / M4 models equipped with the factory blue calipers. It bolts on with no modifications, retains OEM brake bias and ABS behavior, and delivers a major performance upgrade through reduced rotating mass, improved heat management, and serviceable 2-piece construction.

Fitment

• BMW G8X M2 / M3 / M4 — factory blue calipers

• Not for carbon ceramic brake cars (CCB requires Girodisc iron conversion/replacement)

Rotor Specs

• Diameter: 370mm

• Sold as: pair (2 rotors)

Construction & Materials

• 2-piece floating rotor system

• Hat (center section): U.S.-sourced 6061-T6 aircraft-grade aluminum

• Rotor ring: Girodisc proprietary cast iron (poured in the USA, machined in-house)

• Vane design: curved vanes to act as a centrifugal pump, pulling cooling air through the rotor at speed

Floating Hardware (Noise-Controlled)

• 10 high-strength alloy steel drive pins (Girodisc-made, cadmium plated for corrosion resistance)

• Class 12.9 hardware with hardened washers

• Anti-noise spring washers on the rotor side to reduce cold rattle while still allowing heat expansion

• Floating design allows the rotor to self-center between the pads and manage thermal growth more effectively