I've got 35 psi in them right now, but may lower the rear some. The outer lugs aren't making complete contact. The front looks about right, but I'll just have to see how they wear. As far as power, it is lacking with the big tires. It won't pull 5th gear on level ground. I finally wound it out in 4th, but when I went into 5th, it just stayed at the same rpm and slowy lost speed. I will adjust the pump like I did on my other truck, it was night and day on it. I did the math and in 4th gear at 2500 put's me at 60mph, the speedo only shows a little over 40. In 5th at redline, I think it said it would do 76. But for now, 60 seems fast enough sitting up like it does, I don't know that I want to go any faster. I plan on taking it to the truck stop by my house and get it weighed. I think it probably weighs the same as a stock deuce.