Truvativ Stylo Carbon DUBBuilt tough, to handle lines through rock gardens and trail, the new STYLO Carbon is strong, stiff and light Fully compatible with any 1x drivetrain DUB technology features a better engineered bottom bracket and a new spindle design for a more uniform approach to bottom bracket fitment, better sealing against contamination, and a new measure of durability SRAM Model ID: FC STYL C B1 Attributes Crankset Material Carbon Crank Spindle Diameter 28. 99mm