Fitment Note: These C6 Z51 rotors can be used on C5 and C6 base cars with the Z51 rear caliper bracket (GM part # 88964167) or equivalent. The bracket works with the existing calipers and these rotors to complete the conversion to the Z51 brake package.

These GiroDisc 2-piece rotors are a direct replacement for the C6 Z51 330mm rear rotor (known as the "J55" or "heavy-duty" brake package). Weighing in at 12.4 lbs per rotor, these fully floating assemblies help shed unsprung weight and rotating mass from the rear axle of the vehicle.

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 holds up better, and the 48 curved vanes act as a centrifugal pump pulling air in through the hub to effectively cool the rotors under hard use. The 2-piece design means a reusable hat which can be attached to new rings (part number D2-324) 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 Belleville washers for race-ready float while also being street-friendly with no noise from loose hardware.

Diameter: 330mm
Thickness: 26mm
Weight: 12.4 lbs per rotor assembly

The minimum thickness at which we recommend replacing these rings is 24mm. We also recommend replacing them if a crack leads to the edge of the ring.