A single chainring with a wide-range cassette is a wonderfully clean way to tackle so many disciplines, with SRAM the 1x leaders. Gravel, TT, Tri or crits: just pick the right chainring size for the discipline and go. Our lightweight and strong direct mount chainrings feature X-SYNC tooth technology to maximize chain retention, and they bolt to carbon arms with a spectacular but subtle finish.Direct mount chainrings are lighter and stiffer than traditional spider-based rings48T and 50T variants have direct mount aero chainrings for better aerodynamicsSRAM X-SYNC wide-tooth, narrow-tooth chainring technology provides maximum chain controlDUB bottom bracket adds durability and simplicityCan be upgraded to a power meterSpeed: 12BB Compatibility: All SRAM Road DUB BBsChainring Size: 40TCrank arm length: 165mm, 167.5mm, 170mm, 172.5mm, 175mm, 177.5mmChainline: n/aBB Spindle Interface: DUBChainring material: AluminiumGuard: n/aBolt Circle Diameter (BCD): Direct Mount (DM)Crank arm material: