Below are some tire sizes I picked up from a veiw sites. I put this together for my Shadow. On that car, it appears that with stock backsets, I cannot take a tire much wider than 9 inches. Also, it seems "normal' on the couple of the cars I have measures (chrysler FWD, and a mini van) that about 6.5 to 6.75 inches from the hub face to the strut is about average, (what the tire would rub on) and this appears to be the limiting factor (on vans anyway)
 

On the left is the P metric tire size, and to the right of the size is the maximum (section) width and height when mounted on a recommend rim size. These are actual sizes listed by manufactures. Not all sizes are availble from all mfgs., and dimensions change slightly between different manufactures. This is only a guide to get you in the ball park. When you find the tire you like, check the actual size! NA means I could not find a manufacture that makes that size tire, but I did not check EVERY tire manufaturer, So it may be avaiable.

15 inch tires:

 195 60 15      24.2 x 8.0
 205 60 15      24.7 x 8.2
 215 60 15      25.2 x 8.7
 225 60 15      25.6 x 9.0
 235 60 15      26.0 x 9.5
 245 60 15      26.6 x 9.8

 225 55 15      24.8 x 9.2
235 55 15  NA

205 50 15      23.2 x 8.4
 215 50 15      23.4 x 8.9
 225 50 15      24.1 x 9.2
235 50 15 NA

16 inch tires:
215 60 15   26.2 x 8.7
225 60 15  26.6 x 8.9

205 55 16     24.8 x 8.4
 215 55 16     25.2 x 8.9
 225 55 16     25.6 x 9.2
235 55 16      26.1  x 9.7

215 50 16     24.3 x 8.6
 225 50 16     24.8 x 9.2
235 50 16     25.6 x 9.4
245 50 16     25.8 x 10.0


17 inch tires:
215 40 17     23.8 x 8.7
225 40 17    NA
235 40 17    24.5 x 9.7

 215 45 17     24.6 x 8.4
225 45 17     25 x 8.9
 235 45 17    25.6 x 9.7
 245  45 17    25.8 x 9.9

 205 50 17     25.1 x 8.4
 215 50 17     25.4 x 8.9
225 50 17     25.9 x 9.1
235 50 17     26.4 x 9.7

215 55 17   26.3 x 8.9
225 55 17   26.8 x 9.2

18 inch tires:
215 40 18  24.6 x x8.7
225 40 18   25.2 x 9.2
235 40 18  25.4 x 9.7
245 40 18  25.6 x 10.0

215 45 18  25.7 x 8.6
225 45 18  25.9 x 9.0
235 45 18  NA
245 45 18  26.7 x 9.9
 

Below are a few pictures of the wheel center from a stock car wheel. This wheel is designed for rear wheel drive use. As you can see, the main problem with this wheel, like many RWD wheels, is not only the back space, but the clearance for the brake calipers. The is the wheel center only. I had them send me one to use for fitting up the wheel:


Spacer is in lower right part of the picture. Notice small amount I had to grind off


Here is the part I had to grind off.


A front view of the wheel center


Another view from the top.

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Here is a link to a tire size calculator web site