What’s the lowest I can safely lower the psi to on non bead lock wheels

Would like to know your guys’ thoughts. I would hate to ever go too low out on the trail and have my tires de bead off the wheel, that would be a bad day.

 

I don't like to go below 15.

 

It would be helpful if you spec what size tire/rim you are running as much depends upon that. On my 'stock' 17x7 rims with 265/70R17 for example, I've gone as low as 15 psi (NOT bouldering) but on sand/snow.

 

That’s actually exactly my specs. I have Toyo open country at3’s on 40th anniversary wheels.