The Shimano BB-UN300 bottom bracket has been specially designed for bikes with a BSA bottom bracket with English thread. It has a square axle.
- Width: 68 mm
- Thread: English (BSA)
- Axis: Square
- Shaft length: 107 / 110 / 113 / 115 / 117.5 / 118 / 122.5 / 127.5 mm
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