This chainring's tooth profile was developed specifically for 's XTR 12-speed Hyperglide+ chain.Compatible only with Hyperglide+ chains. For use with 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. Item Specifications: Direct Mount Type, Direct Mount , Tooth Count, 30, Drivetrain Speeds, 12, Defined Color, Black, Material, Alloy, Round or Oval, Round, Offset, 3, Chainline/Hub Compatibility, 141/148 Boost Hubs, , , , , , , , , , , , , , , , ,.