wrong and wrong. draw a line on your tire and another inline with it on the driveway. i use sidewalk chaulk. drive the car forward one full tire revolution. and draw another line were the mark on the tire meets the driveway. then measure between the 2 of them. you have your Correct diameter.
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1998 Firebird:buncha parts thats used to make it go fast..... not so much anymore. 
BAAAAAA!!!!!!
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