Couple questions on tire psi. I’ve watched a few YouTube videos, but they say the size and weight of your vehicle should play into consideration. Obviously hummers are a little bit on the heavier side.

So what should my tire psi be when I go off roading? Also, how slow or fast should and can I go when aired down? For context, my tires are factory size and I’m only doing easy to moderate off roading- no big rocks or deep mud (yet&#128516. Thanks!

 

Depends upon what you are wheeling on/in.

Sand dunes, I usually ran 11PSI in the rears and 12 in the fronts. For wheeling in dirt or rocks, more like 16PSI all around.

 

Size of your tire and wheel size (H3s came with 3 different tire sizes and 2 different wheel sizes) would assist in us assessing your Off-road PSI needs.
Type of terrain you are doing your "easy to moderate wheeling" and any modifications to your H3 will also help. Hard packed dirt, loose dirt, sandy loam, etc.
What part of the country are you wheeling also?

 

No sand dunes around here so most of time 2 Bar off road