I have a 69 GTO Hardtop. I run factory 15x7 Rally II's front and rear. I run BFG TA's front and rear. 225/70 x 15 on front that measure 27" inflated on car with 12,000 miles on them. 245/60 x 15 on rear that measure 26" inflated on car (same mileage but with more treadwear due to a few burnouts). At the front lower corner of rocker panel molding to ground measures 10" and at rear lower corner of rocker panel molding to ground measures 10 1/4" (no one in car and 3/4 tank of fuel) (do have a little stiffer spring on rear because do a lot of long distance trip driving and trunk is usually pretty full). On rear, closest point is tire to tailpipe (have 2 1/2" Pypes system mounted as close to frame rail was possible without rattling). Plenty of room sidewall to frame, and wheel well lip). On front closest point is at bottom of wheel well opening lip at rear of wheel well when turning. Could not use any larger diameter tire but, 69 front fender wheel well opening has a slight forward hook to it at bottom rear and I'm thinking a 70 is straight down. Some of these body guys would know if 69 and 70 use same front fenders. Oh, by the way, factory disc brakes which, if I understand correctly moves wheels outboard a fraction of an inch. So there you go.
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