Thread-together bottom brackets provide a secure and stable shell interface for smoother operation and extended bearing life. OS versions are designed for use in frames with worn-out oversized bottom bracket shells. Hybrid AL6061/Nylon fiber cups for a superior fit and noise free operation. Low-friction dual seals protect the bearings from harmful contaminants. Sealed premium bearings are both serviceable and replaceable. Designed for installing BB30 Wide or BB386/BB392 30mm spindle cranks into PF30 or BB386/BB392 frames. Note: Spindle length must be 104mm or longer when used in a 68mm wide shell 108mm or longer when used in a 73mm wide shell. Origin8 Nylon composite BB tools are recommended to avoid the possibility of damaging the cups