Thread: Help a moron with bolt circle diameters??
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Old 07-30-2004, 04:46 PM
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Join Date: Oct 2003
Location: Scappoose, OR
Cobra Make, Engine: ERA 659
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Tom,
For a 5 lug bolt circle with a diameter of 4-1/2", calculating the distance between adjacent studs using the law of cosines gives 2.645". That is very close to the 2-5/8", with .020". I would say that you definitely have a 4-1/2" bolt circle.

Roy
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