These GiroDisc 2-piece rotors are a direct replacement for the rear rotors on the S550 Mustang. Our 2-piece, fully floating assemblies help shed unsprung weight and rotating mass from the vehicle.

The Girodisc rear rotors are approx. 15 lbs vs. 18 lbs for the stock units

This is a 330mm x 25mm rotor for use with the S550 Mustang GT, Mustang Ecoboost with the optional performance package.

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 D2-067) 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.

The minimum thickness at which we recommend replacing these rings is 23mm. We also recommend replacing them if a crack leads to the edge of the ring.

Sold and priced per pair.