Girodisc Porsche 718 GT4 RS Front RotorsThese GiroDisc 2 piece rotors are a direct replacement for the Porsche 718 GT4 RS with the factory iron brake system. Weighing in at around 29 lbs per rotor, these fully floating assemblies help shed unsprung weight and rotating mass from the front axle of the vehicle. The rotor rings are machined from a proprietary casting made of high carbon iron formulated to GiroDiscs specifications. This superior metallurgy results in a rotor that holds up