Shimano BB-UN54/55 Square Taper Bottom Bracket
The Shimano BB-UN54/55 Square Taper bicycle bottom bracket gives you reliable strength for square tapered cranksets.
- Sealed cartridge design offers smooth performance, longer life and less maintenance
- Features a hollow spindle with a plastic cup on the nondrive side
- Spindle Interface Type: Square Taper JIS
- Only compatible with other components using a square taper system
- 73x113mm BB ships with nylon retaining sleeve