Hope pf41 press fit 30mm bottom bracketour press fit bottom brackets feature high quality sealed cartridge bearings providing a solution to the press fit bottom bracket minefield features pf bottom brackets are designed to fit bikes with a threadless bottom bracket cup ability to convert the bottom bracket to fit truvativ gxp cranks with a simple shim adaptor specific fitting tool required purchased separately 30mm crank axle version available to suit 89 5 92 104 5 107 and 121mm bottom br