thanks Steevo
IMHO the 17s don't fill up the wheel well enough on the 68-72 GM A bodies unless you lower the car ALOT...like 2-3 inches....this is a non issue if you are always on perfectly flat streets or just from the trailer to the track...but if you have headers and do any street driving you need some clearance.
Going w/the 18s and some sidewall (I like 45 series) = taller tire and more cushion for the rims and my butt. Plus it allows you to "cheat" a better stance...meaning the taller tire goes farther up in the wheel well giving the appearance that the car is lower. My front tire is about 27" tall and my rears are almost 29". 1" drop springs let the car sit perfectly....plus my headers are still 3" off the ground...
that said if it's race only...road race that is you want a numerically lower sidewall....like 35s or 30s..mine is set up for street/1/4 mile/solo 2...the 45 series is a nice compromise..
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Joe Lincoln
1971 Olds 442 Convertible & 1970 Cutlass Supreme
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