Designed as a direct replacement for cranks or 4-bolt spider utilizing a 120 BCD. These rings will allow you to convert your 120 BCD crankset, like the SRAM XX and others, to a 1x application. They feature Wolf Tooth's proprietary mud clearing Drop-Stop tooth profile design. NOT Compatible with Full Speed Ahead (FSA) 4-bolt cranksets.Chainline is 51mmFeatures Wolf Tooth's Drop-Stop tooth design for maximum chain retentionDrop-Stop chainrings are designed for use with 1x9, 1x10, 1x11 and 1x12 drivetrains (NOT Compatible with Full Speed Ahead (FSA) 4-bolt cranksets)Compatible 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 retentionThis chainring is threaded and requires the stock chainring bolts that came with the crank (not compatible with 6mm/10mm chainring bolts)Made from 7075-T6 aluminum for long lifeItem SpecificationsChainring BCD120ColorBlackDefined ColorBlackDrivetrain Speeds10Drivetrain Speeds11Drivetrain Speeds12Drivetrain Speeds9Ring Position/TypeChain Retaining Single RingTooth Count36 Wolf Tooth 120 BCD Chainrings Chainring UPC: 812719020107