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 12-speed Hyperglide+ chains. 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 Ring Position/Type Chain Retaining Single Ring Tooth Count 32 Drivetrain Speeds 12 Chainring BCD 104 Color Black