The Wolf Tooth Elliptical 104 BCD chainring for Shimano 12-speed Hyperglide+ chain is designed to fit any 104 BCD crankset. The tooth profile was developed specifically for Shimano's XTR, XT, and SLX 12-speed Hyperglide+ chain. Its proprietary Powertrac design has an ovality of 10% and a timing of 112 degrees after top dead center, providing benefits such as greater rear wheel traction. Features: Compatible only with Hyperglide+ chains The Powertrac elliptical design means the diameter is that of a chainring 2t bigger Engineered proprietary tooth profile maintains the quiet and smooth performance of the HG+ drivetrain with optimal chain retention Prevents premature ring and chain wear that can come from non-optimized profiles Specs: ColorBlack Ring Position/TypeChain Retaining Single Ring Chainring BCD104 Defined Color ListBlack MaterialAluminum Drivetrain Speeds12 Tooth Count34