Girodisc Ferrari F430 Front Iron Rotor ConversionThe Girodisc system is a direct replacement iron rotor conversion from the OEM CCM disc however a different brake pad with an annulus (pad swept area) of 66mm or less must be used. This is done to keep the rotor weight at a reasonable level. If we manufactured a rotor with the same annulus as the OEM CCM rotors they would be unnecessarily heavy. The necessary pad shape is very common and also found on the Nissan GT R, Cadillac CTS V and most AMG