What is the extent of your experience wheeling in the snow? I live 9 miles from the nearest trails and keep my pressure at 5 psi all winter. Snow is deep in the woods with drifts around five feet. The difference between 10 psi and 5 psi means everything. At 5 psi I've wheeled a dozen times without loosing a bead (no beadlocks here) just this season. Sand, snow, it's all the same.
While I agree that airing down a little for on road is good, I never said to air down to 5 psi. Wilson misunderstood me. Apparently I was not initially clear in what I meant.
I meant I reduced my tire pressure 5 psi below normal when it snows or gets icy. My normal is 27 psi. So when it snows or ices I use 22 psi.
I was referring to on road in Winter conditions.
For very deep snow (typically off road, or off traveled roads) in Winter, I do think reducing about 10 psi is helpful (for my 30" tires). So then I'd be running 17 psi. (27 - 10 = 17)
You're talking about something a bit different. You're talking about airing down to literally run 5 psi. That might be good in deep snow off traveled roads if you have some really big tires. I don't know. Most of my experience is with 235, 30, 31, and 33; and I prefer 30s.
I think you're talking about much larger tires in much deeper snow than what I was. I'm not disagreeing with you. Just saying apples and oranges.
I think we agree that
(some amount) of airing down is helpful for Winter conditions on or off road.
The amount of airing down depends on conditions and tire size, IMO.
For 235, 30, 31, and perhaps 33s, I think a 5 psi reduction (normal street pressure - 5 psi) is good on road in typical Winter road conditons.
P.S. - I have no idea if a tire will debead at 5 psi. I've never run any psi that low. I assume it'd depend on the tire size and rim size. But for my 30" tire size and Winter conditions, 17 psi is the lowest I'd run for deep snow, and 22 psi for traveled Winter roads.