This chainring's tooth profile was developed specifically for '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-optimized profiles. Item Specifications: Direct Mount Type, Direct Mount CINCH, Tooth Count, 30, Drivetrain Speeds, 12, Material, Alloy, Round or Oval, Oval, Offset, 3, Chainline/Hub Compatibility, 141/148 Boost Hubs, keyword search, Hyperglide Plus, , , , , , , , , , , , , , , , ,.