Designed to face the worst British weather has to offer, Hope's threaded bottom brackets feature high quality sealed cartridge bearings and fit a variety of cranksets.Fits 24mm crank spindles. High quality stainless steel sealed bearings for less friction and greater durability. Free running labyryinth seal protects bearings and has less drag. Convertible to SRAM/Truvativ GXP with the use of optional bottom bracket conversion kit (sold separately). Item Specifications: Bottom Bracket Shell I.D., 1.37, BB/Frame Interface, English, BB Shell Width (mm), 68, BB Shell Width (mm), 73, Weight, 110, Spindle Interface Type, Hollowtech II, Spindle Interface Type, FSA MegaExo, Spindle Interface Type, FSA MegaExo Light, Spindle Interface Type, RaceFace EXI, Defined Color, Purple,.