Finding the correct bottom bracket for your frame can be challenging. SRAM DUB: 29mm; 29x42; SRAM introduced the DUB cranks in 2018. 29mm diameter spindles. Two-piece system. BB30: 30mm; 6806 (Drive) 6806 (Non-Drive) 30mm spindle diameter cranks. Uses wave washer on drive side of crankset to take up any play in crank. Compatibility Will take 386EVO cranks and traditional external BB cranks Other names n/a Other notes Matches the wide bearing spacing of a BSA external BB with a large 30mm spindle Bottom Bracket Standards. Crank spindle is pressed into the drive side crank arm. To accurately determine the bottom bracket standard in your frame, it is best that you remove your crankset, and any installed bottom bracket cups or bearings. Meant to be used across all BB standards.