Oh, for sure, off road is a different animal. There you often want to increase contact patch so you don't sink or so the tire can cover medium size bumps and not get stuck between two peaks of a rock, for instance.
On ice, you want a cold tire. The minute you spin and heat up the tire you lose most of your traction.
With chains, lower pressure so the car does not vibrate excessively.
Quote:
"Except in aquaplaning", is a huge caveat. When you are sliding on ice, snow, or slush, you are actually hydroplaning.
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I think most people think of aqua planing as on a hard surface with liquid water. To slide on ice there does not
have to be a liquid layer, but there often is.
There are a lot of "it depends" when it comes to tire traction and pressure. The best would be a variable pressure system. I think the Porsche 959 had this.