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Radius of the wheel would be 9.36", diameter twice of that, 18.72", circumference would be 58.78". Are you trying to figure out the current gear ratios? Because you can find that info on Protege FAQ
"Probable impossibilities are to be preferred to improbable possibilities."
185 * .6 * 2 = componet of diameter due to tire
convert to inches...
add 14
and multiply by Pi
answer.
FWIW, it'd just be easier to look up a 185/60/14 on tire rack and look at the specs page. Not all tires are created equal either, so your number is only a guess.
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