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  1. #1
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    9 speed crank 7 speed drive train?

    would it be compatible to use a 9 speed ultegra crank with an old 105 7 speed drive train? I bought a bike with a 105 drive train 7 speed...however the cranks were ofmega 53-42 and its a little steep for where i ride. so a buddy tossed me a set of ultegra cranks to put on and we were wondering if it was a compatible system?

  2. #2
    Senior Member sydney's Avatar
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    Quote Originally Posted by Dan0930
    would it be compatible to use a 9 speed ultegra crank with an old 105 7 speed drive train? I bought a bike with a 105 drive train 7 speed...however the cranks were ofmega 53-42 and its a little steep for where i ride. so a buddy tossed me a set of ultegra cranks to put on and we were wondering if it was a compatible system?
    it works.

  3. #3
    Sometimes knows stuff. rmfnla's Avatar
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    Probably need a new BB (square taper > Octalink).
    Today, I believe my jurisdiction ends here...

  4. #4
    Senior Member sydney's Avatar
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    Quote Originally Posted by rmfnla
    Probably need a new BB (square taper > Octalink).
    No probably.It's a given.

  5. #5
    Sometimes knows stuff. rmfnla's Avatar
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    Quote Originally Posted by sydney
    No probably.It's a given.
    Being diplomatic for a change; you might want to give it a try...

    Today, I believe my jurisdiction ends here...

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