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  1. #1
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    EX9 chainline questions

    What is the chainline measurement on a 08 EX9?

    I need to buy a new BB and am torn between a 51mm or 56mm..

    thanks

  2. #2
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    well i went with 51mm..

    the chain line looked to be 44.6mm to my center ring..

  3. #3
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    Well for some official info

    The BB measures 67.95mm but trek says to us ea 73mm shell outboard bearing with a 51mm chainline.

    i will update if my 68/51 outboard fits

  4. #4
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    51mm is kind of standard for both 68 & 73mm BB shells
    56mm would be the equivalent for 83 BB width, like on DH bikes...

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