PF30 with outboard bearing BB for use with 29mm spindle SRAM DUB cranksets when used in PF30 frames The two machined aluminum cups thread together keeping the bottom bracket stable in the frame, increasing bearing life, and simplifying maintenance Can be used with 61mm to 73mm BB shells - 61mm shells require spacers not included *Specialized Carbon OSBB with 61mm shell width will need additional 3.5mm cup spacers 61/73mm PF30 Sram DUB Alloy 156g