RACE FACE - CINCH DIRECT MOUNT ALLOY Narrow Wide tooth profiling ensures ultimate chain retention. Attaches as part of the RF Cinch system (using common Park BBT-22 bottom bracket tool) - allowing to switch between DM rings/spiders with ease. Utilizes RF proprietary spline design7075-T6 aluminium, aerospace grade strength. Stiff 4mm plate thickness to transfer loads without flexing. Compatible for 9, 10, 11 and 12 speed (12speed non-shimano chain) Colour: BLACK, BLUE, RED, GREEN, ORANGE, PURPLE Built For: XC/Trail/AM/DHWeight:33g (24T) - 112g (42T) Compatible With: Race Face cranks with CINCH System Interface Size: 24T, 26T, 28T, 30T, 32T, 34T, 36T