My 69 pumps around 700 out the rear and right now i am running 20x10.5s since it was the 1st thing i found off Craigslist. I want to go down to 17s since that is the smallest i can fit over my brakes. I wanted to know how thin of wheel is too thin? since most classic wheels that wouldn't need the 2in spacers i run now only go up to like 9 or 9.5 inch wide for less than a grand a wheel.