The GiroDisc 2-piece rotor system is a direct replacement for the OE rotor, no modifications are necessary. The disc will bolt directly to the car and work with OE calipers perfectly. Once the Girodisc system is in place, simply replace the cast iron rotor ring when needed. The average Girodisc 2-piece rotor is approx 2kg lighter per rotor then the stock units. This reduction in rotational and unsprung weight allows for quicker acceleration and suspension response.
Please Note: These GiroDisc rear rotors are a direct replacement for the OE disc and OE pads, however when used on 981 Spyder or 718 GTS 4.0 these allow for use of a different brake pad with a larger annulus (pad swept area) for a full rotor sweep. The necessary pad shape is FMSI 1417 which are very common and found on the Porsche 991 & 992 Carrera S. Please contact us directly to provide the correct part numbers.