Designed to fit 4-arm 110 Asymmetric BCD Shimano Road Cranksets. These rings feature the patent pending Drop-Stop asymmetrical tooth design for the best in wear life, mud clearance, and chain retention.Sizes 38T and larger are compatible with Dura Ace 9100, Ultegra 8000 and 105 R7000 but a slight modification is required due to a change in the crank arm profileDrop-Stop chainrings are designed for use with 1x9, 1x10, 1x11 and 1x12 drivetrainsCompatible with all 10-, 11-, and 12-speed chains, with the exception of Shimano 12-speed chainsShimano 12-speed chains require the use of Wolf Tooth's Shimano 12-speed specific chainringsIf using a 9-speed drivetrain, use a 10-speed chain, which will provide a tighter fit for better chain retentionCompatible with Dura Ace 9000, Ultegra 6800, 105 5800, Tiagra 4703, and Tiagra 4700Made from 7075-T6 aluminum for long lifeUse of a clutch-style rear derailleur is recommendedItem SpecificationsChainring BCD110 Shimano AsymmetricColorBlackDefined ColorBlackDrivetrain Speeds10Drivetrain Speeds11Drivetrain Speeds12Drivetrain Speeds9Ring Position/TypeChain Retaining Single RingTooth Count38 Wolf Tooth 110 Asymmetrical BCD Chainrings for Shimano Chainring UPC: 812719022033