Shimano BB-UN300-K bottom bracket, BSA square taper 110 mm/68 mm

The Shimano BB-UN300-K is a high-quality square taper bottom bracket, perfect for standard drivetrains on road or mountain bikes. It is designed for bottom brackets with a BSA (British Standard) thread and a width of 68 mm. Its 110 mm axle allows for a compact chainline and compatibility with a wide range of cranksets. Thanks to its sealed cartridge, it is resistant to water and dust and requires virtually no maintenance. Easy to fit, it offers a reliable and durable solution at an affordable price.

Technical specifications

- Type: Square taper bottom bracket (cartridge)
- Thread: BSA (1.37 x 24 TPI – English)
- Bottom bracket width: 68 mm
- Axle length: 110 mm
- Compatibility: Road bike, MTB, city bike, trekking bike
- Sealing: Sealed cartridge for a long service life
- Installation: Quick and easy
- Brand: Shimano
- Shimano part number: BB-UN300-K