The Sram GXP Fat Bike Bottom Bracket will keep pedals insulated and turning smoothly. SRAM uses gutter seal technology that vastly improves sealing against the elements while reducing seal drag. The GXP system uses two bicycle-specific cartridge bearings and eight seals for a smooth and long lasting ride. Sram GXP Fat Bike Bottom Bracket Features SRAM uses gutter seal technology that vastly improves sealing against the elements while reducing seal drag. The GXP system uses two bicycle-specific cartridge bearings and eight seals for a smooth and long lasting ride. Suitable for 100mm Frame Bottom Bracket Shell English Thread