Girodisc Rear Replacement Rotor Rings, 2015-2022 Mustang GT - Ecoboost

Replacement rings are sold in pairs and include replacement hardware. The only parts you will reuse are your existing GiroDisc hats.

Please note that unless specifically noted, GiroDisc replacement rings are only designed to work with GiroDisc hats. They are not designed to be used with other brands, including hats from cars equipped with 2-piece rotors from the factory.

These rotor rings are 350mm x 25 mm. The weight of the complete rotor assembles is 15 lb vs the OEM 18 lb resulting in a 3 lb weight reduction per side. This results in reduced unsprung weight and rotational inertia for better accelerations and braking.

The rotor utilizes 72 curved directional vanes, developed in racing to act as a centrifugal pump to force cooling air through the disc.

The rotor and hat have a floating mount system, which utilizes 8 or 10 high-strength alloy steel drive pins, manufactured by Girodisc in the USA to our own specifications and cadmium plated for a long-lasting corrosion resistance. These pins take the load from braking actions while maintaining the axial and radial float between the hat and disc. The pins are secured by grade 12 cap screws with hardened washers. In order to keep the rotors from making noise when cold, the pins are mounted with anti-noise spring washers on the rotor side which allow the rotor to grow with heat expansion but eliminate the rattle and noise associated with floating rotors. This float also allows the rotor to self-center between the pads.

Sold/priced per pair