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  1. #1
    ya rly!
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    how do you measure the bolt pattern for chainrings?

    N/t

  2. #2
    Cornucopia of Awesomeness baxtefer's Avatar
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    measure adjacent holes center to center and multiply by 1.7
    {o,o**
    |)__)
    -"-"-

    O RLY?

  3. #3
    ya rly!
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    NM i found it on sheldon brown. this can drop. thanks!

  4. #4
    asleep at the wheel fixedpip's Avatar
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    For those wanting to know, the URL is:

    http://www.sheldonbrown.com/gloss_bo-z.html

    BCD is the first item in this section. Has a very clear explanation on how to measure it for 4 and 5 bolt crank arms, as well as a table of common bcds and their uses so you can double check your calculation.

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