Girodisc McLaren 380mm Rear RotorsThe Girodisc system is a direct replacement for the OE CCM disc. No modifications are necessary, the disc will bolt directly to the car and work with the original calipers without issue. The central hat section of the disc is made from 6061 T6 aircraft specification aluminum. The disc is made from cast iron to the same specification and material as used by professional racing organizations. It is a curved vane design, developed in racing to act as a