Machined engineering-grade Delrin inserts for adapting bottom brackets to a different type of crankset spindle. – Adapts PF30 and Cannondale BB30-73A bottom brackets for use with SRAM/TruVativ cranksets – Delrin adaptors fit between bearings and crank spindle – BB Shell Width (mm): 68 mm , 73 mm – Spindle Interface Type: TruVativ GXP – BB/Frame Interface: PF30