Wolf Tooth Elliptical Direct Mount Chainring - Shimano Direct Mount Boost 3mm Offset, 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+ 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 and chain wear that can come from non optimized profiles Tooth Count 32, 34 Drivetrain Speeds 12 Round or Oval Oval Offset 3