Wheels Manufacturing Bottom Bracket Wrench The Wheels Manufacturing double-sided bottom bracket wrench is designed to install or remove external threaded bottom bracket shells with outside diameters of 44mm or 48. 5mm. Both sides of the wrench have 16 notches and the tool is compatible with all current Wheels Manufacturing bottom brackets with notched cups. Features Constructed of: Machined aluminum (red)Fits onto: 44mm and 48. 5mm bottom bracket shells Compatible with: All current Wheels Manufacturing bottom brackets with notched cups. Manufacturer part number: WRENCH-BB48-44 | Wheels Manufacturing | Bottom Bracket Wrench | Red | 48. 5Mm & 44Mm, 16 Notch