Wolf Tooth Elliptical Direct Mount Chainring - 32t, RaceFace CINCH Boost, Drop-Stop ST for Shimano 12 Speed HG+, BlackThis chainring's tooth profile was developed specifically for Shimano's XTR 12 speed Hyperglide+ chain. Elliptical rings provide smoother, more efficient pedal rotation, which means better traction Compatible only with Hyperglide+ 12 speed chains For use with any RaceFace CINCH crankset Maintains quiet and smooth performance of the Hyperglide+ drivetrain with exceptional chain retention Prevents premature ring and chain wear that can come from non