Wheels Manufacturing PF30 Outboard Bottom Bracket - For 30mm Spindle, ABEC-3 Bearings, PressFit Thread Together, RedWheels Manufacturing PF30 Outbound bottom brackets are for use with frames that utilize a PF30 bottom bracket standard. Features two machined aluminum thread together cups that keeps the bottom bracket stable in the frame, increases bearing life, and simplifies maintenance. This means no more creaking, smoother operation, longer bearing life, and quick bearing replacement. Product Specifics Bottom Bracket Shell I. D.: 46 BB Frame Interface: PF30 BB