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The GiroDisc slotted rear ring for 2014–2020 BMW M2, M3 and M4 (F8X with blue calipers) is a 380mm slotted replacement friction surface designed to help maintain pad contact and channel gases and debris away from the pad. These rear rings match F8X blue-caliper systems; confirm caliper and pad compatibility before installation to ensure a correct fit.
GiroDisc 14-20 BMW M2/M3/M4 (F8X w/Blue Calipers) 380mm Slotted Rear Rings
