I was planning on buying 17x10 trailready beadlock wheels for my 76. When I called to order them the guy helping me said that I should run 15x10's. He said that they would do better offroad when aired down due to the bigger sidewall on the tire. How much more performance would you get out of the 15's over the 17's or is he giving me a line of S#$%? I plan on running 37" tires, I want performance but also a good looking wheel. If anyone has some pictures of this style of rim I would like to see them on a bronco.