The World's Largest Online Bike Store
    • Shimano UN55 Square Taper Bottom Bracket

    • Click image to zoom
        • $15.99 15.99
        • RRP $29.99 - $35.99
        • Save Up To 56%
    • Select Colour
      Select Option
      English Thread
      Italian Thread
      Select Size
      68 x 107mm
      68 x 110mm
      68 x 113mm
      68 x 115mm
      68 x 118mm
      68 x 122.5mm
      68 x 127mm
      70 x 107mm
      70 x 110mm
      70 x 113mm
      70 x 115mm
      73 x 107mm
      73 x 110mm
      73 x 113mm
      73 x 118mm
      73 x 122.5mm

Shimano UN55 Square Taper Bottom Bracket

Shimano Road UN55 model has super-accurate bearings for smooth operation and improved durability.


  • 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
  • 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

A 2 year warranty is offered with all Shimano products from Chain Reaction Cycles (3 years on Dura-Ace and XTR products).

Buy Shimano Components from Chain Reaction Cycles, the World's Largest Online Bike Store.

  • Delivery cost $9.99
  • Delivers toUnited States of America
  • 365 Days return or exchange

    If you're not completely satisfied with an item you may return it within 12 months of purchase. We'll give you a full refund if the item hasn't been used or fitted.

    More information on returns
  • Pay by Bank Transfer, PayPal or Card


  • Colour: Silver
  • Size: 73 x 110mm, 73 x 113mm, 73 x 118mm, 73 x 122.5mm, 70 x 107mm, 70 x 110mm, 70 x 113mm, 70 x 115mm, 68 x 113mm, 68 x 110mm, 68 x 118mm, 68 x 115mm, 68 x 127mm, 68 x 122.5mm, 73 x 107mm, 68 x 107mm
  • Option: English Thread, Italian Thread

When buying Bottom Brackets also consider...