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  1. #1
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    what size BB is the rush 4?

    hey guys

    theres a local guy who is selling parts off his cannondale rush 4 and i was wondering what size is the bottom bracket on that?
    68mm?

  2. #2
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    Hey w0318

    Just checked the Owners supplement for the rush 4 and found that the BB is:- '68mm, English /SI Hollowgram'

    See here http://www.cannondale.com/asset/iu_f...plement_en.pdf page 22

    Hope this helps?

  3. #3
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    thanks someone was selling the crank off a Rush but i know some cannondales dont use the 68mm bb.


    so does the SI hollogram fit a 68bb or is it only for bb30

  4. #4
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    BB shells

    The BB30 only really relates to the ID or diameter of the shell. The 68/73mm size relates to the width of the bb shell and really has nothing to do with the diameter of cranks that either shell will accept. There are adapters available that can be installed in a BB30 to accept either a standard 68 or 73mm BB which is 24mm. Standard crank bearings are apprx 24mm ID where the BB30 crank bearings measure 30mm.

    I did read a thread somewhere on here where a guy had a machinist modify a 68mm standard shell to accept a BB30 and crank. I can't even remember if it was a Cannondale bike. I think it was a brand x bike.
    Last edited by jdp526; 07-05-2008 at 09:57 PM.

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