The Shimano BB-UN300 bottom bracket is mounted on frames with a 73 mm wide BSA bottom bracket. Its square axle measures 122.5 mm.
- Brand: Shimano
- Product : Bottom bracket housing
- Range : BB-UN300
- Axis type: Square
- Shaft length: 122.5 mm
- Housing width: 73 mm
- Discipline: Mountain biking
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