
Shimano BB-UN300 Square Tapered Bottom Bracket
- Maintenance-free sealed cartridge bearing
- Fast and easy installation without adjustment
- Durable, hard-wearing sealed cartridge
The Shimano BB-UN300 Square Tapered is a good quality bottom bracket for traditional chain sets with super-accurate bearings for smooth operation and improved durability. It uses a maintenance-free sealed cartridge bearing assembly that keeps out dirt, mud, and water for long bearing life.
- A good quality bottom bracket for traditional chain sets
- Super-accurate bearings for smooth operation and improved durability
- Durable, hard-wearing sealed cartridge bottom bracket with square tapered spindle fitting
- Maintenance-free sealed cartridge bearing assembly keeps out dirt, mud, and water for long bearing life
- Fast and easy installation without adjustment
- Narrow body allows clearance for cable routing under the bottom bracket



