02-25-2008, 01:57 PM
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CC Member
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Join Date: Sep 2002
Location: Hickory,
NC
Cobra Make, Engine: ERA 427SC w/427so, ERA GT #2002
Posts: 1,106
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Not Ranked
Simple enough, Jim.  All you need to know is the tread you're wanting to obtain and the wheel-hub surface measurement from side to side. Subtract the two and divide the result by two. If the desired tread is a bigger number, say 52.5" versus 50.0", the answer would be a positive 2.5". Divided by two, the offset of each wheel from center would be 1.25". With a zero offset wheel, backspacing would be 3.00" with a 6" wheel plus allowance for the bead. But in this case, back spacing would be 3.00" minus 1.25", or 1.75" to set the center of the tires on the ground at zero camber to 52.5" apart, which is track, or tread width. Does this make sense? 
__________________
Tom
"If you can make black marks on a straight from the time you turn out of a corner until the braking point of the next turn, then you have enough HORSEPOWER." Mark Donohue
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