Wolf Tooth 107 BCD Chainring 38t Compatible SRAM 107 BCD Drop Stop B 4 Bolt BLK CheckoutTitle=Zipp Conversion Caps Color Carbon Rear Axle 12mm Color Carbon Rear Axle 12mm Thru x 148mm Rim Width (Internal) 30 Cassette Body Type SRAM XDR Wheel Size 29" Defined Color Black ISO Diameter 622 road 29" Tire Type Tubeless Ready Hub Brake Compatibility 6 Bolt Disc Valve Presta Mesh and zippered outer pockets Color Black Ring Position Type Chain Retaining Single Ring Tooth Count 38 Round or Oval Round Drivetrain Speeds 9 Drivetrain Speeds 10 Drivetrain Speeds 11 Drivetrain Speeds 12 Chainring BCD 107 Material Aluminum Defined Color Black Compatible with all 10 11 and 12 speed chains with the exception of Shimano 12 speed chains