CERAMIC HYBRID EXTERNAL BB CUP *(WRENCH-BB48-44) Wheels Mfg Double End BB Wrench, 16-notch BB tool - 48.5 / 44mm - Bearings: Enduro Ceramic Hybrid - Color: Gray - Bottom Bracket/Frame Interface: ISO/English or BSA Threaded (1.37 in x 24 TPI) - Bottom Bracket Shell Width(mm): 68mm - Bottom Bracket Shell I.D.: 33.6-33.9 mm - Crank Spindle Type: HollowTech II (Shimano, FSA, Etc.) - Crank Spindle Diameter: 24mm (shimano) or 22/24mm (sram)