* 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.