I believe 225 70/15's are the OEM tire size equal to the old GR70/15 size.  They should fit and perform fine since that is what the car was designed for.  If yours are rubbing, check the height between the ground and the wheel well arch, as well as the ground to frame and compare to spec, your springs may be sagging.

 Jim on my 73 I have BFG TAs on all 4 corners, P255/60/15. Very mean lookin big meats!

Hey Jim, I have 225/70/15's on my 77, anything larger would rub. I wanted to go bigger like Dave but it would not work. I couldn't make rt. or lt. turns without wheel rub.  Gene gs77vet2006-11-07 18:25:08

Dave, you have no rubbing issues with those tires????

    I run 235-60-15 T/A's on the front and 275-50-15's on the rear. No rubbing problem at all. For 16 years I ran 265-50-15's on the front with the 275-50-15 on the rear.. The 265's on the front only rubbed when turned to lock. Looked like a slot car. I went with the smaller tire this time for more of the big/little look.

 Jim just had to trim about 3/8 inch from my rocker panel trim. Only time it rubs the frame on the left side is when I back out of my garage and turn hard left to the steering stop. Besides from that no rubbing. Handles great.

its your springs. i have a 74 and i have the 225/70 R 15 and i am using the firehawk indy 500 tires.  they run great but i did rub here and there if i turned too tight. i had my springs checked out and found they were sagging. i replaced them and my ride 100% better.  it sounds like extra work but it fixes two problems. your ride height for your tires and your suspension for better handling. Movie Collector2006-11-08 16:41:26

thanks for all the updates guys! I was thinking of going with the grand touring springs anyway.... or would they just lower it??? 74stingray4542006-11-08 18:31:01

i replaced mine with OEM springs, of course i am restoring mine to original 1974, so i dont know much about other types.

OK, thanks Jeremy....