Wolf Tooth Direct Mount Chainring - 32t, Shimano Direct Mount, For Super Boost+ Cranks, Requires 12-Speed Hyperglide+ Chain, BlackThis chainring's tooth profile was developed specifically for Shimano's XTR 12 speed Hyperglide+ chain Compatible only with Hyperglide+ 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 and chain wear that can come from non optimized profiles Direct Mount Type: Direct Mount Shimano Drivetrain Speeds: 12 Material: Alloy