Originally Posted by CanyonCarver

I did some math the other day to determine the size of tire I want to fit to my 18 X 8 wheels. In case anybody is interested.......

225/50 - 16 = 24.858" diameter stock
225/40 - 18 = 25.086" diameter will raise car .114"
235/40 - 18 = 24.401" diameter will lower car .228"
245/40 - 18 = 25.716" diameter will raise car .429"
245/35 - 18 = 24.751" diameter will lower car by .053, best for matching stock diameter.

255/40 - 17 = 25.031" diameter raises car .086" from above stock.
275/35 - 18 = 25.578" " raises car .360" "

I think I'm going for the 235/40-18's if I can find them.

Originally Posted by CanyonCarver

255/40 - 17 = 25.031" diameter raises car .086" from above stock.
275/35 - 18 = 25.578" " raises car .360" "

width x a/r (.40 or .35 or ?) x 2 x .03937 + wheel dia.