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  1. #1
    Senior Member CaptainHaddock's Avatar
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    RT2 Megaexo BB size

    So I cannot seem to find any kind of white-paper or documentation otherwise on the size of the captain BB for a Cannondale RT2 2012. What say you Tandem crew?

    thanks,

    James
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  2. #2
    certified vegetarian veggie's Avatar
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  3. #3
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    Regular English thread BB. 1.37" x 24 tpi. Or do you want some other dimension?

  4. #4
    Senior Member CaptainHaddock's Avatar
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    That actually cleared up one point of confusion, the other being is the BB 68mm, or 73mm? (if there is somewhere on the external cups I should be looking for this info, I have not seen it)

    Thanks!
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    http://app.strava.com/clubs/tandems]Strava Tandem Club

  5. #5
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    68mm. This is the standard width for an English BB. 73mm would be weird. Italian (M36 x 24 tpi x right hand thread both sides) is 70mm.

  6. #6
    Senior Member waynesulak's Avatar
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    Quote Originally Posted by Dean V View Post
    68mm. This is the standard width for an English BB. 73mm would be weird. Italian (M36 x 24 tpi x right hand thread both sides) is 70mm.
    The 73mm BB is a mountain bike standard BB width that was adopted by Santana. FSA tandem cranks are made to this standard and use a spacer when installed on a 68mm BB shell. Using an Italian BB on a tandem would put the thread locker and torque to the test with twice the power tending to unscrew one side of the BB.

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