Ok...how about *Shaved* BFG Radial T/As?

There are still great 15 inch tires out there. The 325-50/15 Nittos I have on the back of my '70 E-Body are Y - speed rated. (186 mph) and I'm picking up a set of V rated (149 mph) 245-60/15's for the front end on Monday. They have larger and smaller sizes in 15" for those too.

The ride quality difference between 15" wheels and 17 or 18" wheels is significant. Short sidewalls have their pluses, but ride quality isn't one of them. I've yet to see an older muscle car with 17's or 18's that looks right.