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  1. #1
    mtbr member
    Join Date
    May 2005

    SRAM XX ring GXP vs BB30

    What is the difference between a 39th GXP and 39th BB30?
    Can I use a 39th GXP on a BB30 crank??


  2. #2
    mtbr member
    Reputation: Alexgonzalezmi's Avatar
    Join Date
    Nov 2011
    The qfactor of the cranks are different but that has no bearing in the rings so you could use them as they are the same.

  3. #3
    I'm Slow
    Reputation: paulrb02's Avatar
    Join Date
    Aug 2009
    XX Chainring Questions & Swap with a X.0 Chainring Possible?

    Basically its the outside pin, its different because of the different Q-factors Mountain Biking in South Alabama.

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