The Wolf Tooth 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. FEATURES: Compatible only with Hyperglide+ chains 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: Tooth Count : 36 Ring Position/Type : Chain Retaining Single Ring Drivetrain Speeds : 12 Chainring BCD : 104 Material : Aluminum