Sram: Elegant and secure direct-mount X-SYNC chainrings from the company that originated the 1x drivetrain for the ultimate in consistent chain control over the long haul.FEATURESDirect mount chainrings in 38t through 46tDUB™ bottom bracket adds durability and simplicityWide chainline crankset to fit the biggest gravel tiresLonger DUB crank spindle accommodates both Road and MTB width frame bottom bracket standards for unmatched cross-compatibility across brandsCompatible with 135, 142 and Boost rear spacing SPECIFICATIONSSpeeds: 12BB Compatibility: All SRAM Road WIDE DUB BBsChainring Size: 40T, 46TCrank arm length: 160mm, 165mm, 170mm, 172.5mm, 175mmChainline: 47.5mmBB Spindle Interface: DUBChainring material: AluminumGuard: No GuardBolt Circle Diameter (BCD): Direct Mount (DM)Crank arm material: AluminumColor (Crank arm): Black