GiroDisc Porsche 911 Turbo/Turbo S (991), Turbo (992) Front Rotors911 Turbo Turbo S (991) w PCCB, F uses iron rotor pad shape 911 Turbo (992) 911 Turbo (992) The Girodisc system is a direct replacement for the OE disc however you must use the same pad shape that is used on the 991 Turbo that came with the iron rotors from the factory. The annulus (pad swept height) of these pads is smaller than the large PCCB pads, this is done to keep the rotor weight at a reasonable level and allow far better pad selection. If we