SRAM Apex D1 WideSingle ring drivetrain simplifies functionality and reduces weight Wide chainline crankset to fit the biggest gravel tires Longer DUB crank spindle accommodates both Road and MTB width frame bottom bracket standards for unmatched cross compatibility across brands Compatible with 135mm, 142mm, and Boost rear spacing X SYNC wide tooth, narrow tooth chainring technology provides maximum chain control DUB bottom bracket adds durability and simplicity SRAM