We just bought a set for my wife's Denali.
I bought 275s though, but even on the stock rims which are 8" wide...they look really skinny because of how rounded the top of the tire is.
I need new tires and the wife and I can't decide what wheels and tires to go with. What wheel would look best with 305's? I dont want it stretched. I saw them on a set of 20x14's and looked like straight a$$.