wheels?

[Lightspeed]

i know im probly gonna sound stupid asking this question but everyone here talks about putting 8 inch wide wheels on their stangs....well i have some 8 inch wide wheels on mine and the tires stick out past the fenders just enough to where they scrub if i hit a bump too hard, the wheels on there now seem to have a deeper outer dish than most wheels i see, i was wondering what the technical name for this was, if there is one at all? im hoping someone can decipher my lack of intellect and help me out on this, the wheels on there now are cragar ss's and im pretty sure if i can find a wheel that sets in further that my tires wont scrub anymore but im not sure if there is any measurements on the wheel itself to help me accomplish finding the right wheel. id appreciate anyones input on this issue, thanks