For those with Iphones, just stumbled on this app called wheel App plus, and this thing is pretty nice... Clears up your fitment issues by spacers, offset, rim size, tire size etc...

Thought I'd let you all know

 

Have you tried it? noticed that we got to pay $$ for it.

 

It's a pretty cool app. but its one of those things where when u figure it out you really wont need it again..
I have a jailbroken itouch so I DL for free