Joe, that's the slick size I'm using on my car (Phoenix F/X 10.5" x 28.5"). They're mounted on the same wheels I've been using since I began racing my GN a long time ago which are 15"x8" with a
rear spacing of 3.5", with rolled fender lips, but NO frame modification at all. Three things I had to do this year was 1° to change the 23 year old, sagged rear coil springs, 2° to change the lower control arms I had (H&R with poly bushings) for some Wolfe Racecraft adjustables with rod ends and 3° I installed some aluminium spacers under the coil springs to raise the rear of the car because when launching the car hard, the tires rubbed against the wheel openings damaging both the tires and mouldings which I had to replace about a month ago. I still have some H&R adjustable uppers...
You'd probably have to go to a rear spacing close to 4.5" for a 10" wide rim, but I'm not 100% sure...
![Confused :confused: :confused:](https://cdn.jsdelivr.net/joypixels/assets/8.0/png/unicode/64/1f615.png)
I have 10" wide wheels for the street which fit without rubbing, but street tires do not have a sidewall bulge as big as the slicks have...
![Roll Eyes :rolleyes: :rolleyes:](https://cdn.jsdelivr.net/joypixels/assets/8.0/png/unicode/64/1f644.png)
Hope this helps!
Claude. :wink: