Replaces standard BB90/95 press in bearings commonly found on Trek bicycles with a solid, unified thread-together bottom bracket interface Thread-together bottom brackets provide a secure and stable shell interface for smoother operation and extended bearing life Low-friction dual seals protect the bearings from harmful contaminants Sealed premium bearings are serviceable Models available for both Shimano HTII 24mm and SRAM GXP 22/24mm spindles Requires a special tool for installation (J&B# 610756) 90.5/95.5mm x 37mm BB90/95 SRAM GXP 22/24mm AL6061 Black