BB30 frame with Shimano BB90 XTR crank. HELP!!!- Mtbr.com
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  1. #1
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    BB30 frame with Shimano BB90 XTR crank. HELP!!!

    It's the first time I'm buying a whole bike as separate parts on my own... and of course as a newbie I'm paying the bitter price .

    I bought a Cannondale Flash Carbon frame with BB30 hole and and Shimano XTR crank Fc-m980 which later I found out it's BB90. ............... Again

    So, what should I do now?

    1) Install an adapter/converter (adding 50g) to use the XTR? (cheaper option)

    2) Buy a Cannondale SL Hollowgram / Truvativ and sell the XTR? (expensive option)

    3) ?


    ps: I live in S. America, so I took months importing all parts... sadly it's not like go to the LBS and exchange cranks....

  2. #2
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    Nothing about that crank is BB90, that designation refers to the BB/frame interface. The cheapest option and the route I would go is to instal a BB30 adaptor into the frame. They come in two styles one that has threads so you can use a normal english threaded BB. And one that has bearings so you can press in a 24mm ID bearing for use with your Shimano cranks.

  3. #3
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    Quote Originally Posted by customfab View Post
    Nothing about that crank is BB90, that designation refers to the BB/frame interface. The cheapest option and the route I would go is to instal a BB30 adaptor into the frame. They come in two styles one that has threads so you can use a normal english threaded BB. And one that has bearings so you can press in a 24mm ID bearing for use with your Shimano cranks.
    Thanks!

    Performance wise, is there any disadvantage in use the adapter?

    What do you say about this one:2012 Wheels Mfg BB30 Adapter for Shimano - Competitive Cyclist

  4. #4
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    That's a great solution provided the BB30 bearings are already pressed into your frame.

    Disadvantages, probably not the Shimano cranks are top of the line in my book so you get a better crankset to work with your frame. You pick up some weight in the delrin adaptor but it's not going to be much. I doubt you pt out enough power to overwhelm the stiffness of a XTR crank either.

  5. #5
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    That's great to hear. Thank you!

  6. #6
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    Can someone tell me the true diffentance between the BB30 Bottom Bracket and the BB90 bottom bracket.

  7. #7
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    Quote Originally Posted by kbslow View Post
    Can someone tell me the true diffentance between the BB30 Bottom Bracket and the BB90 bottom bracket.
    BB30 uses a 30 mm crank spindle. BB 90 is actually a trek specific fitment. BB86 is the Shimano version. Either one of them are both intended to be used with 24mm crank spindles. Or 22/24 spindles in the case of Sram GXP fitments. All of these setups are designed to remove threaded BB shells in frames, which makes them easier to manufacture.

  8. #8
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    Or this...

    Race Face 2012

    Just install and slide your crank in.

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