Max tire size '71 Demon
On the front of my Dart Sport I have 205/65R15 on 7" rims with 4.5" backspacing, they do not rub and look right. The rear has 255/60R15 on the same rims, which is also the biggest recomended size for that rim width. You could go a little bigger on a wider rim though and it would also look meaner ( 10" rim with a 275 tire would just fit)(future plans).
http://s241.photobucket.com/albums/...tion=view¤t=DartSportwithstripes003.jpg
I had smaller tires in the rear when the pic was taken but the front are the same