Shimano BB-UN300 Bottom Bracket British Thread

High-performance maintenance-free square taper bottom bracket with precision sealed bearings.

• 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