Thread-together bottom brackets provide a secure and stable shell interface for smoother operation and extended bearing life 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 86-92mm x 41mm BB86/BB92 SRAM GXP 22/24mm AL6061/Nylon Fiber 103g