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Old 06-11-2014, 06:15 PM   #4
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Join Date: Jan 2006
Location: Vermont
Posts: 2,832

Try to measure the "bolt hole circle" as accurately as possible. It's the diameter of the circle on which all of the CENTERS of the bolt holes rest and can be determined by measuring from one edge of a bolt hole, across the middle of the hub, to the corresponding edge of the exact opposite bolt hole. The discrepancy from the actual centers will cancel out using that method.
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