BigLow

I ran ~10 PSI pre-beadlock for most rock crawling and trails on 35s with the stock wheels. I did brake large chunks of aluminum off the rim at that PSI, but I whaled on them with heavy throttle.

Now I run about 4-6 PSI (depending on if it's my leaky tire) on beadlocks for crawling, but increase it to 12 PSI for trails where I will drive 40+ mph off road.

Blue Fish

rule of thumb is one third (33%) of factory recommended psi

GJeep

For 35"s Mickey Thompson MTZ (Load D), on JKUR, I use --

DD: 28~30 psi
Most trails & obstacles: 18~20 psi
Real tough trails & obstacles or deep soft sand: 16 psi

I usually don't do extreme rock crawling. For the occasional "single rock crawl", I don't bother to air down below 16 psi.

My offroading includes a variety of terrains -- woody mountainous trails / rocky, graveled, sandy or muddy trails / desert (rocky & dusty (very smooth) steps, steep slopes / rocky-bottomed streams (up to ~20" deep water).
Never went below 16 psi, and never had a real grab problem.
Tried 14, and it wasn't better than 16 psi in a degree that justified going lower than 16.

16~18, or 16~20, seem to be the good range for my loaded 4-dr.
As I drive along ever changing level of difficulty, this pressure gives good grip and still allows good handling and accurate steering at faster speed on easier parts of the way.

About the same pressures were also used in my previous tires, BFGoodrich all-terrain.

KCCO JK

On my Kevlar MT/R's, I normally run them at 28PSI, and air down to 15 almost exclusively. If the trail is very difficult, I might air down to 12... but until i get beadlocks.. that's as low as I'm comfortable going. Hasn't failed me yet.

lkjk

Nope, depends on tire and load range, rim width, weight of rig, conditions, etc. rule of thumb is it depends.

i wheeled moab all weekend at 8.5 psi no beadlocks, pro comp steelie rims, surprised I didn't pop a bead

2climbbig

How low you can go (without beedlocks) really depends on you wheel width, wheel size and tire size/width. When I was running 35x12.5x15R on a 8" wide wheel I could wheel all day long at 14psi. Now if I was running that same tire with 10" wide rims, then I probably would not venture below 18 psi. Hope that helps.

Chapman89

For you guys w/ stock wheels/tires (Goodyear's) what are you airing down to? Obviously this is a short term solution until I get 35's.

I was at URE over the weekend. I aired down to 15 psi - ended up cutting a tire. I guess it was random.

2climbbig

The stock Goodyear tires cut easy when aired down. I gave my son my stock tires for his jeep and he sliced through two of them in one outing.

D3ADLY

I usually run 8 lbs in the rear and 9 lbs in the front wheeling. No beadlocks.

wml

8-12 psi (I have beadlocks) but completely dependent on trail conditions. I've noticed that my duratracs are not great in the squishy stuff when aired way down.