Designed for gravel and road racing, and for those looking to optimize each detail in pursuit of speed, Wolf Tooth Aero Chainrings are strong, lightweight, and profiled to mate perfectly with your crankset for a clean, integrated look. Taking advantage of 1x drivetrain systems and wider-range rear cassettes, Aero Chainrings are available in sizes 46t to 50t to provide similar overall range to standard 2x drivetrain configurations. They feature our patented Drop-Stop design for the best wear life, chain retention, and mud clearance. Drop-Stop B is optimized for SRAM Eagle and Flattop chains.Fits SRAM AXS 107 BCD cranks with a removable power meter spider and SRAM 107 BCD cranks with removable spidersNot compatible with SRAM Rival 107 BCD cranksets with integrated (non-removable) spiders (models ID's FC-RIV-D1 and PM-RIV-D1)Premium CNC machined 7075-T6 aluminum for strength, stiffness, and light weightFeatures Wolf Tooth s patented Drop-Stop wide/narrow tooth profile for the ultimate chain retention and mud-shedding abilityItem SpecificationsChainring BCD107ColorBlackDefined ColorBlackDrivetrain Speeds10Drivetrain Speeds11Drivetrain Speeds12Drivetrain Speeds9MaterialAluminumRing Position/TypeChain Retaining Single RingRound or OvalRoundTooth Count50 Wolf Tooth Aero 107 BCD Chainrings for SRAM Direct Mount Chainrings UPC: 812719029414