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Shimano UN55 Bottom Bracket

A good quality bottom bracket for traditional chainsets with super-accurate bearings for smooth operation and improved durability. The BB is also durable, hard-wearing sealed cartridge bottom bracket with square tapered spindle fitting.

  • Lightweight hollow spindle
  • 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