Hope PressFit 41 Bottom Bracket Description: Designed to face the worst British weather has to offer, Hope Press-fit bottom brackets feature high quality sealed bearings and secure installation that fit a variety of cranks. Features: Fits cranksets with a 24mm in diameter spindle that is 121mm long Aluminum cups are pressed in and held in place by a threaded center tube to keep everything tight and to prevent unwanted noises Stainless steel sealed bearings offer less friction and greater durability Ideally suited for fat tired mountain bikes Specifications: Frame Interface: BB121 | PF41 Spindle Interface: 24mm (FSA MegaExo | RaceFace EXI | Shimano Hollowtech II | Surly OD) Bottom Bracket Shell ID: 41mm Shell Width: 121mm Bearings: Sealed Stainless Steel Cartridge Color: Black Weight: 110g