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 approx 1,0kg lighter per rotor then the stock units. GiroDisc 3,6kg vs. 4,6kg for the stock units. To allow these wider vented rotors to be installed the OE brackets need to be adjusted; 1.5 mm needs to be removed from the long, inside of the bracket and 3.0 mm from the short, outside of the bracket. When also installing new pads, each pad needs 2mm shaved off.