This is an OPR Custom Hy-Brid 380mm x 34mm rotor for use on the S197 Mustang platform when using the 2015-2023 S550 Mustang GT with the optional performance package six piston Brembo calipers. This custom assembly is built by Girodisc for us exclusively. The S550 6 Piston Brembo Calipers are designed for a 34mm rotor ring. The OEM GT500 rotors are 32mm. Running the thicker rotor allows the caliper pistons to remain in their intended position rather than hanging out of the caliper to reach the thinner rotor ring. This Rotor Assembly also centers the caliper over the rotor ring equally so no shimming of the caliper is required. This extra rotor mass also helps with thermal management and only comes with a 1.7 pound weight penalty.

THESE WILL NOT WORK WITH THE OEM 13-14 GT500 Brembo 6 Piston Calipers

The Girodisc system is a direct replacement for the OE disc. No modifications are necessary. The disc will bolt directly to the car and work with OE 2015-2023 6 Piston Brembo calipers perfectly. By upgrading your brakes with lightweight high performance replacements as opposed to a big brake kit, your factory bias is maintained as well as your ABS efficiency. The Girodisc front rotors are approx 24.1 lbs vs. 33.4 lbs for an equivlent OEM rotor. This reduction in rotational and unsprung weight allows for quicker acceleration and suspension response.

The central hat section of our rotor is made from strictly U.S. sourced 6061-T6 aircraft specification aluminum.  The disc is made from our own proprietary cast iron, poured in the USA and machined from start to finish in house at Girodisc.  The rotor utilizes 72 internal curved 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.

Once the Girodisc system is in place, simply replace the cast iron rotor when needed.

Sold/priced per pair.