GiroDisc Toyota GR Supra, BMW 348mm Front Rotors

These GiroDisc 2-piece rotors are a direct replacement for the 348mm front rotors on the following vehicles:

• Toyota GR Supra (3.0L), excluding Final Edition
• G2X M340i & M440i
• G2X with optional M Sport brakes
• G01 X3 M40i & G02 X4 M40i
• G29 Z4 M40i

They may also fit other BMW G-chassis models with 348mm front rotors outside of this list.

The rotor rings are machined from a proprietary casting made of high-carbon iron formulated to GiroDisc's specifications. This superior metallurgy results in a rotor that better withstands hard use, and the curved vanes act as a centrifugal pump pulling air in through the hub to cool the discs. The 2-piece design has a reusable hat which can be installed onto new rings when they need to be replaced.

All major components including the hats, rotor rings, and drive pins are manufactured in-house at our facility in Bellingham, WA from domestically-sourced materials. The hat is made from 6061-T6 aluminum and coated in a black anodize finish. The drive pins are made from a high-strength steel alloy and cadmium-plated for corrosion resistance. All rotors are assembled with spring clips and spring washers for race-ready float while also being street-friendly with no noise from loose hardware.

Outer diameter: 348mm
Thickness: 36mm
Minimum thickness: 34mm
Weight: 24.8 lbs per rotor assembly
Vane count: 72 curved vanes
Replacement rings: D1-307

We recommend replacing the rings when they reach minimum thickness or if a crack forms leading to the edge of the ring.