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Shimano UN55 Bottom Bracket

  • Consistently great quality cartridge sealed Shimano bottom bracket.
  • The Shimano UN55 works well with any near-any modern crank that fits a traditional 'square taper' (as opposed to splined) bottom bracket
  • Available in many sizes.
  • SizePriceAvailability 
    68*107mm£29.99In Stock
    68*110mm£29.99In Stock
    68*113mm£29.99In Stock
    68*115mm£29.99In Stock
    68*118mm£29.99In Stock
    68*122.5mm£29.99In Stock
    68*127mm£29.99In Stock (2 To 3 Days)
    73*110mm£29.99In Stock
    73*113mm£29.99In Stock
    73*122.5mm£29.99In Stock

    Shimano UN55 Sealed Bottom Bracket

    Consistently great quality cartridge sealed Shimano bottom bracket. The UN55 has a metal LH cup. Metal cups tend to be much easier to remove in years to come compared with the nylon cups some bottom brackets such as the Shimano UN26 employs.

    The Shimano UN55 works well with any near-any modern crank that fits a traditional 'square taper' (as opposed to splined) bottom bracket so the UN55 comes in loads of sizes:

    • The first number (eg 68) refers to the width of the frame's bottom bracket shell. This is usually 68mm but some companies prefer 73mm.
    • The second number (eg 113) refers to the length of the axle (ignore the threaded portion). Generally speaking, modern low profile cranks use short 110 and 113mm axles. Older bikes with straighter cranks like Shimano Tourney usually need a longer 122.5mm axle. If your present setup works fine chainline-wise, don't mess with a good thing. Replace it with an axle of the same length.
    • Where 2 axle lengths will work equally well, we would always recommend the shorter one (it's stiffer and it has a lower Q-factor) - as long as the crank still clears the chainstays.
    • UN55s are all British Standard threading because this is the international standard used on almost any bike made in Britain, the USA, China, Taiwan and Japan.
    • 346g based upon weighing one example of this bottom bracket at Edinburgh Bicycle Co-op's head office in October 2011.

    Shimano

    Shimano are the world's largest bicycle component company, thanks to their ability to innovate and perfect - think indexed gear shifting, Hyperglide cassettes STI, XT, SPD, STEPS…

    See all Bottom Brackets from Shimano
    See all products from Shimano
    See all Bottom Brackets

    SizeBarcode
    68*113mm4524667778752
    68*113mm689228778757
    68*113mm5023857494810
    68*118mm4524667778790
    68*118mm689228778795
    68*118mm5023857494834
    68*107mm4524667778806
    68*107mm689228778801
    68*110mm4524667778882
    68*110mm689228778887
    68*115mm4524667778899
    68*115mm689228778894
    68*122.5mm4524667778875
    68*122.5mm689228778870
    68*122.5mm5023857494841
    68*127mm4524667778769
    68*127mm689228778764
    73*110mm4524667778820
    73*110mm689228778825
    73*113mm4524667778745
    73*113mm689228778740
    73*122.5mm4524667778868

    Disclaimer
    Our suppliers reserve the right to change specifications and prices without notice. Edinburgh Bicycle Cooperative will do all it can to maintain prices and specifications on this web site, however we do reserve the right to change specifications and prices without notice. Similarly, despite the wonders of modern computers, it is realistic to expect the colour of any item bought to differ subtly from the image online.

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    Ask a question
    Q. Hi, I have a Edinburgh cycles "revolution tangent" 9 speed courier type bike. I need to replace the bottom bracket after 10 years (already!!!!) but not sure what size i need. Is it a 68/113? Thanks
    A. We are glad to hear that your Tangent is still going strong and that the bottom bracket has lasted as long. Unfortunately, we do not keep a record of bottom bracket sizes used on our bikes. To determine the bottom bracket size need you would have to measure the spindle width of the bottom bracket fitted. The size will likely be stamped on the bottom bracket as well but to check this the bottom bracket would need to be removed.

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