The Red Cycling Products Cartridge B.B. Tool is the ideal tool for assembling and disassembling square or multi-tooth cartridge inner bearings in frames with BSA bottom bracket housings.
The robust and solid tool is intended for 20-speed toothing of the inner bearing shells. It can be combined with either a 24 mm open-end wrench or a 1/2" ratchet. With the right tool, it is easy to change the inner bearing at home.