The Shimano Alivio BB-UN300 bottom bracket is mounted on frames with a BSA bottom bracket. Several sizes available.
- Brand: Shimano
- Product : Bottom bracket housing
- Range : Alivio BB-UN300
- Axis type: Square
- Shaft length: 110mm, 113mm, 117mm, 123mm
- Housing width: 68 mm
- Thread: BSA
- Discipline: Mountain biking
- Rigid and lightweight for efficient power transfer
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