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. Models available for both Shimano HTII 24mm and SRAM GXP 22/24mm spindles. Replaces all standard BB86/92 press-fit bottom brackets. Origin8 Nylon composite BB tools are recommended to avoid the possibility of damaging the cups