PF30 Threaded bottom bracket features two machined aluminum cups that thread together ensuring the bottom bracket remains stable in the frame, increasing bearing life, and simplifying maintenance. This means no more creaking, smoother operation, longer bearing life, and really quick bearing replacement. Directly replaces all OEM PF30 bottom brackets. Note: Use only bottom bracket tools compatible with 16-notch, 48.5mm outer diameter cups. – Bearings: Enduro ZER Ceramic Hybrid – Color: Black – Bottom Bracket/Frame Interface: PF30, Specialized Carbon OSBB, BBRight Press Fit – Bottom Bracket Shell Width (mm): 61mm to 79mm – Bottom Bracket Shell I.D.: 46mm – Crank Spindle Type: BB30 – Crank Spindle Diameter: 30mm – Weight: 106g