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Crank help

discusdandiscusdan Posts: 10
edited May 2016 in MTB workshop & tech
Hi there I have a 24 bicycles pornking frame with a US bottom bracket. I need gears on the back though and bought a shimano deore xt crank hoping it will fit with a bb adaptor but I've since been told there aren't any adaptors for that crank. Any body know for sure ? Thanks

Posts

  • The RookieThe Rookie Posts: 27,811
    What BB shell is in the frame? It's unclear from your post whether the BB is U/S or a standard called US I've never heard of (and it's not in the bikeradar guide).
    Currently riding a Whyte T130C, X0 drivetrain, Magura Trail brakes converted to mixed wheel size (homebuilt wheels) with 140mm Fox 34 Rhythm and RP23 suspension. 12.2Kg.
  • The RookieThe Rookie Posts: 27,811
    Looking at photo', it looks like an eccentric bottom bracket, they are normally English thread MTB fitment.
    Currently riding a Whyte T130C, X0 drivetrain, Magura Trail brakes converted to mixed wheel size (homebuilt wheels) with 140mm Fox 34 Rhythm and RP23 suspension. 12.2Kg.
  • discusdandiscusdan Posts: 10
    Hi its a us 50mm shell I believe :)
  • The RookieThe Rookie Posts: 27,811
    That would be to take probably either a BMX style BB or an EBB adaptor at a guess, is it threaded or plain?
    Currently riding a Whyte T130C, X0 drivetrain, Magura Trail brakes converted to mixed wheel size (homebuilt wheels) with 140mm Fox 34 Rhythm and RP23 suspension. 12.2Kg.
  • discusdandiscusdan Posts: 10
    Hi its plain. I had the let toy 4 model too with a profile bmx crank I fitted
  • The RookieThe Rookie Posts: 27,811
    You can get adaptors to fit inside the shell to take HT2, it's common on EBB single speed frames like the Mariachi's for example.

    Not heard it called US before.....but am aware of it.
    Currently riding a Whyte T130C, X0 drivetrain, Magura Trail brakes converted to mixed wheel size (homebuilt wheels) with 140mm Fox 34 Rhythm and RP23 suspension. 12.2Kg.
  • discusdandiscusdan Posts: 10
    Ok thanks mate its just the same size as what a bmx bb would be. Don't suppose you have any links to hollow tech 2 adaptors?
  • The RookieThe Rookie Posts: 27,811
    https://www.amazon.co.uk/Truvativ-Botto ... entries*=0

    Comes up in a few searches, that was just the first hit.
    Currently riding a Whyte T130C, X0 drivetrain, Magura Trail brakes converted to mixed wheel size (homebuilt wheels) with 140mm Fox 34 Rhythm and RP23 suspension. 12.2Kg.
  • discusdandiscusdan Posts: 10
    Thank you. I'm wondering if there's more to it with the hollowtech crank though as chain reaction cycles said there's nothing that they know of that I can use to get it to fit
  • discusdandiscusdan Posts: 10
    68mm width. 50 mm diameter
  • The RookieThe Rookie Posts: 27,811
    All I know is that the single speed EBB are an adaptor in a BMX shell and take any 68mm BB, I have three friends who ride Marriachi single speed bikes and are familiar with what they use.
    Currently riding a Whyte T130C, X0 drivetrain, Magura Trail brakes converted to mixed wheel size (homebuilt wheels) with 140mm Fox 34 Rhythm and RP23 suspension. 12.2Kg.
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