O.D Crankset Bottom Bracket73, 100mm, Moonlander & Ice Cream Truck (ICT) specific.OD Specification for 73, 100mm & Moonlnader Widths;BB Shell Width (mm): 73 or 100 mmBB/Frame Interface: EnglishBearing I.D. is 24mmSpindle Interface Type: Surly OD , Shimano Hollowtech IIICT OD Specification:BB Shell Width (mm): 121 mm , 132 mmBB/Frame Interface: PF41 , BB86Bottom Bracket Shell I.D.: 41Spindle Interface Type: Shimano Hollowtech II , Surly ODPF cups are 41mm in diameterBearing I.D. is 24mmOD bottom bracket comes with telescoping center sleeve for added durabilityHigh quality double labyrinth sealed stainless Enduro bearings with corrosion resistant coating3 additional 1mm spacers are provided to help with chain line and crank arm clearance