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  1. #1
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    2011 Trek Fuel Ex 6 Bolt Center Diameter

    I am going to convert my setup up to a 1x9 and my question my bike has the stock shimano M542 44/32/22 crank and I want to get a salsa chainring, am I safe to assume that the bolt center diameter is 104mm or will I have to figure this out myself?
    2011 Trek Remedy 7

  2. #2
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    Yup, middle and outer c-ring are a 104 bolt pattern. The small inner one is 64. Generally speaking, if you aren't also installing a bash guard in the big ring position, you will need slightly shorter chain ring bolts. Some bash guards come with their own bolts.
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