is this how i measure bcd's- pic content

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bkt

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............is the 1st pic correct or the 2nd?
 

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Neither. If you imagine the bolts create a circle its that diameter.
 
Though you can extrapolate the diameter from pic 2, 64.7mm is 110 or ATB and 55.4mm is 94 or compact*






*courtesy of sheldon
 
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