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Old 09-05-09, 07:29 AM
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Location: Alabama USA
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Bikes: TREK 1000c

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Originally Posted by zuwapa View Post
My bike isn't the build from Surly's website.

I found that the large and medium Center-Center measurement is 74mm on a 4 bolt crank. The small C-C measurement is 47mm. How would my BCD be figured?
With a 4 bolt pattern, the center of bolt to the opposite center of bolt (not adjacent bolt) is your BCD.
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