Originally Posted by Charley3
The narrower the better for Winter roads. So a 34 x 11.5 or a 35 x 11.5 would be a reasonably good width (though I'd prefer narrower if available).
This is one of those statements that keeps getting said, but never really gets proven. The story goes, the narrower tire sinks down into the snow and gets a grip. Of course, the physics of the thing tells us this in not true. A 3500 pound rig puts exactly the same amount of rubber on the ground with a narrow tire as it does with a wide tire at the same internal psi. So, the psi on the snow is exactly the same, so it doesn't really sink into the snow more. But, people keep saying it and other people keep believing it.
What is true is that a taller tire presents a better angle of attack to the snow it is pushing through, gets better leverage on the snow, and requires less rotating force to overcome the snow and is therefore less likely to lose traction. Taller the better. Wider vs. narrower? Prove it.