• Shimano UN55 Square Taper Bottom Bracket

    • HOT PRODUCT154 people are looking at this item.

        • $14.24 - $21.49 14.24 21.49
        • RRP $37.35 - $39.99
        • Save Up To 64%
    • Select Colour
      Select Option
      British Thread
      English Thread
      Italian Thread
      Select Size
      68 x 107mm
      68 x 110mm
      68 x 113mm
      68 x 115mm
      68 x 118mm
      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
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Shimano UN55 Square Taper Bottom Bracket

The Shimano UN55 Square Taper Bottom Bracket has super-accurate bearings for smooth operation and improved durability. With a durable and hard-wearing sealed cartridge, this bottom bracket is maintenance free and keeps dirt, water, and mud from penetrating the unit.


  • 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 Footwear from Chain Reaction Cycles, the World's Largest Online Bike Store.

  • Delivery cost $6.00
  • Delivery toUSA
  • 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 the component hasn’t been fitted.

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


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

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Bottom Brackets Buying Guide

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