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The PSI is pretty much dependant upon the terrain and load. I run more air on rocks to keep some clearance and to give the tire some support to wrap edges and stiffen the lugs...and contact pressure.
Mud/sand just depends upon the consistancy/thrix properties, depends on any expected air time and degree of flotation needed for the expected speed ranges...from as low as the bead will keep...8 - 10 psi for me, up to 30 psi or so if there's a bottom to bite. (Ooops...There's a straight line for some one...)
Hill climb/loose surface detritus runs usually benefit from a more rock PSI type setting...say around 20 -25 psi for both on average is a good compromise.
If a newbie is trying to get a magic number...they'll just have to learn to experiment to see what works for them...some tires just work better with more or less pressure than others.
The jeep ahead of me last year looked like it was running up a climb straddling an erosion culvert with four FLAT BFG MT's. He couldn't keep the tires on the straddle lines because the rubber was slipping all over the place, and he lost his line, and flipped the jeep, almost crushing his dog (Leashed to roll bar....add to don't do list...)....So - There is a point of diminishing return with pressure.
I use an on-board compressor to make changes as needed, saves a trip to the gas station or three...cost about $40 - 50 if I remember, and can do a 32 x 11.5/15 from 10 to 32 psi in around 3 - 4 minutes, that's about 15 minutes or so to air back up as about the most time I need....and trail adjustments are much faster of course.
Good Luck!
- Lance
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