I have 15 by 8 inch rims on the back with 3.25 back spacing what is the biggest tire I can put on them with out them sticking out of the fender well? I was looking at Mickey Thompson ET street tires they are 27 x 10.5 x 15 can I fit a bigger one on or not?

 

Um...I know all GM wheels after a certain year fit on any GM lol dont know if that helps, how wide the wheel is, not sure...I think it can go pretty deep, For example I have seen mustangs with skinny assed ones, and ones wider than on Corvettes.