The GiroDisc 400mm slotted front ring for 2014–2020 BMW M2, M3 and M4 (F8X) with red, silver or gold calipers, including CCM-equipped options, is a direct-fit 400mm front-ring replacement. The slotted surface helps evacuate gases and debris to promote consistent pad contact, and the ring installs to the compatible center hat for F8X M-series front braking setups.
GiroDisc 14-20 BMW M2/M3/M4 (F8X w/Red/Silver/Gold Calipers Incl CCM) 400mm Slotted Front Rings