Shimano BB-UN55 Bottom Bracket British Thread 73mm
The BB-UN55 Bottom Bracket British Thread 73mm from Shimano fits traditional style square taper cranksets. The sealed design and durable bearings give an excellent service life and the threaded fitting means quiet, creak free operation. It is for frames with a 73mm wide bottom bracket shell, and the slim shell allows plenty of room for cable routing.
- A good quality bottom bracket for traditional chainsets
- 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