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Shimano BB-UN300 Square Bottom Bracket | BSA 73 mm
This is the new Shimano BB-UN300 square axle bottom bracket, which replaces older models - BB-UN26 and BB-UN55. This bottom bracket is suitable for a variety of bicycles: from city and touring to older road and mountain bikes.
Thanks to several different axle lengths and the BSA threading, the BB-UN300 is easy to match with most bicycles.
The bottom bracket connects the axle and the cranks through a square axle, ensuring a strong connection.
The set does not include crank fixing bolts.
| Technical features | |
| Category | City, Touring, Road, MTB |
| BB Type | BSA |
| Crank Brand | Shimano |
| Axle Type | Square |
| Frame width (mm) | 73 |
| Hub Length (mm) | 107, 110, 113, 115, 117.5, 118, 122.5, 127.5 |
| Bearing material | Steel |
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