Shimano UN300 cartridge bearing Square Taper (JIS) bottom bracket with alloy cups. Successor to the UN26 and UN55 series, this component covers a wide range of applications from Touring and City bikes to older Road and Mountain bikes.
Suitable for traditional square mount chainsets, featuring a 68mm shell with BSA (English) 1.370" x 24tpi thread.
Crank bolts are not included.
| main material | aluminium |
| bottom bracket type | squared |
| length (in mm) | 113 mm |
| condition | new |