What PSI for new tires?

I just recently picked up some new 31x10.50r15 Milestar Patagonia M/T tires and have them on some original tacoma rims that are 15x7.

My question is what tire pressure should I keep them at while driving on road?
Also what tire pressure should I use when going off-road?

Thanks in advance!

 

That's a broad question. "off road" is the wildcard. As a general guideline, air down just enough to get traction, without looking too much ground clearance. Generally speaking, non-committal, around 17psi should be about the lower-limit, to try and preclude popping the bead. If you have no way to air back up and need to drive along pavement for awhile after wheeling, I'd probably not go lower than low 20psi. Probably would keep it above 25 even, depending how far I'd need to drive to get more air.

 

What load range are the tires?

 

Normal every day stuff- search for the chalk test.
Off road- as low as you dare, depending on the load/sidewall rating and ability to air back up afterward. It also really depends on what type of terrain as well. If you're just mobbin' trails 18-20 might free great But if you may need an increased foot print for a tricky boulder garden so 12-15 might be ok...

 

With 31x10.50s on 15x8s I went as low as 8 psi on trails like wheeler lake and spring creek for maximum grip. Every tire is a little different but 30psi should get you close for road driving and dial it in with a chalk test and butt from there

 

Do the chalk test.

/thread