Originally Posted by biffgnar
Depends on what type of wheeling you are doing with it, but generally I'd say you should be comfortable in the 10-12 range.
I hate this answer, but it is true.
You are safe at 10-12.
Of course you can go lower but you will have to experiment with it.
You will know you are about at the limit when the tire starts burping air when you are fighting to turn the wheel. If you aren't doing rocks, there isn't much benefit to going lower than 10 anyway. You lose ground clearance fast.
Rocks are a different story. 3-4psi with double bead locks is the name of the game. Oh. And 33" or bigger tires will help a lot.