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Shimano BB-UN300 bottom bracket, BSA square taper, 118 mm/73 mm
Shimano BB-UN300 – BSA square taper with 118 mm axle / 73 mm length
The Shimano BB-UN300 is a robust and reliable square-axle bottom bracket, ideal for smooth shifting on road bikes, mountain bikes or hybrid bikes. It is compatible with 73 mm BSA (British Standard) threaded frames. Its 118 mm axle ensures good chainline with many standard cranksets. The bottom bracket is sealed for optimal protection against water and dirt, thereby extending its service life. Simple to install, it offers excellent value for money for everyday or leisure use.
Technical specifications
- Type: Square-axle bottom bracket
- Thread: BSA (English) – 1.37 x 24 TPI
- Bottom bracket width: 73 mm
- Axle length: 118 mm
- Compatibility: Road bikes, mountain bikes, touring bikes
- Technology: Sealed cartridge (minimal maintenance)
- Brand: Shimano
- Shimano part number: BB-UN300
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