Wolf Tooth Elliptical Direct Mount Chainring - 32t Shimano DM Boost 3mm Offset Drop-Stop ST Requires 12-Speed HG+ Chain BLKWolf Tooth Elliptical Direct Mount Chainring 32t Shimano Direct Mount Boost 3mm Offset Requires 12 Speed Hyperglide+ Chain Black. This chainrings tooth profile was developed specifically for Shimanos XTR 12 speed Hyperglide+ chain. Compatible only with Hyperglide+ 12 speed chains For use with Shimano XTR M9100 series cranksets Maintains quiet and smooth performance of the Hyperglide+ drivetrain with exceptional chain retention Prevents premature ring