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 Hollowtech II cranksets - Delrin adaptors fit between bearings and crank spindle - BB Shell Width (mm): 68 mm , 73 mm - Spindle Interface Type: Hollowtech II - BB/Frame Interface: PF30