The stock adrenalin wheels are 20"x8.0" with a 30mm offset. I just did a set of 20x8.5" ET 40mm with 275/45-20 tires no rubs and the tire comes out even with the outer edge of the fender. Click on my library to see pics of the truck, also go to the website below and play with tire/wheel comparison feature. It will tell you what fits and what doesn't. Bob