These rings are designed for Surly OD cranks, but are compatible with other 5-bolt 94 BCD cranks. These rings feature the patent pending Drop-Stop asymmetrical tooth design for the best in wear life, mud clearance, and chain retention.Features Wolf Tooth's Drop-Stop tooth design for maximum chain retentionDrop-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 retentionMade from 7075-T6 aluminum for long lifeUse of a clutch-style rear derailleur is recommendedItem SpecificationsChainring BCD94ColorBlackDefined ColorBlackDrivetrain Speeds10Drivetrain Speeds11Drivetrain Speeds12Drivetrain Speeds9MaterialAluminumRing Position/TypeChain Retaining Single RingTooth Count32