Race Face\'s new Direct Mount Single ring. Designed and machined in our Vancouver, BC facility, tested on the North Shore and in the Whistler Bike Park. Features: 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 design. 7075-T6 aluminum, aerospace grade strength. Stiff 4mm plate thickness to transfer loads without flexing. Compatible for 9, 10, 11 and 12 speed*. Specification: Compatable with: RF cranks with CINCH System interface. Weight: 41g (26t) ranging up to 82g (36T).