What is everybody running for pressure on the trail,
which IH do you run,
where do you run,
what type of terrain,
How many popped beads?

68 pickup 32 year old 31s vinyl bias ply snowys (tall and skinny)
any trerain I can mack it on
but right now I converting to 4wd and will be runing 35's bfg

Correct tire pressure will very alot. Depends on many things like tire size, type, vehicle weight, terrain,etc. etc. Biggest factor is tire size. I have a chart that came with my auto deflators that is a recomended tire size/ inflation pressure chart. This is only a starting point and you have to just try it and adjust from there. What size are your tires, I will see what it says. If your running 16.5" rims don't air them down. These rims must have full pressure or you will loose a bead. Rims can be modified to get around this.
To answer your original question, 70 scout 800 extra heavy at 5500lbs. 38.5 14.50 swamper SX's and 7.5 lbs works good for me.I use modified 16.5" rims and have not popped a bead.
Used on local pacific NW trails. Mostly rutted mudy with some rocks thrown in to make it interesting.:)

Yep it's always different. When I ran my 35 BFGs I would go down to about 6 pound on the Con and such but would drop it down to 4 in the snow. The tires were glued to the rim with that glue they use for circle track racers so I never once lost a bead. But, when I'd just play around in the local hills or local creek beds and such, I wouldn't even bother to air down. I'd just keep them at the 28 pounds I always ran.

Now with my 39.5's, I've only run them once cause I blew up my front and just now got it all back together. I aired them down to 8 pounds but think I should have taken them down to 4 or so because I just couldn't flew the bias ply sidewall very well. I need to go have them glued on too so I can go down to the below 5 range.

Another thing is weight. My rig used to way 3940 before I did the full width and 39" tire swap. I figure I probably gained only 500 lbs in weight or so. Therefore, the 4500 lbs rig just doesn't push down as much on these tires as Abba's 7000 lb rig did. So, I can air down more than he could, BUT then again, I HAVE to air down more than he did just to get the sidewalls to flex.

Hope that helps a little :D

No scout. Running jeeps. Weigh about 3900 pounds so they are kinda close. I was running 15 pounds in my yj with the 35" ssr's but just bought boggers so I dont know yet. 10 pounds was to low as it was to hard to steer with welded diffs. In the tj with 35" ssr's 10 pounds it perfect. I run mud and long rocky steep hills. Muskeg too!

Whith 35 bfg I ran 10 on back 12 on front.And my Scout is not 7000.lbs Curtis.

On my 33x12.50 Swampers I would go down to 5 psi on the Moab/Farmington slickrock or snow, and around 8 psi for most eveything else. The 35x12.50 BFG MT's that I am currently running don't see much below 12 to 15 psi. I had a set of Armstrong Desert Dogs a couple of years ago, and I have pics (somewhere:confused:) where both of those front tires were REALLY squishy in a slickrock bowl in NM. They were folded up to the point where I was actually driving ON the sidewalls. I have never lost a bead (watch, now that I said it... it will happen:rolleyes: ).

This is all on a "77 Scout II.

Aubrey

I run 36x12.50 TSL Radials and usally run between 8-10 Psi, and have never lost a bead, anything lower than that its hard to steer and my truck tries to push the front end around. This is on a 4600 LB 76 Terra, I'am going to 38x12.50x16.5's om hummer bead locks once i do the full width thing, so i will probley run less air to get the Bias tires to flex. Acouple years ago i ran 33x12.50 wild countrys on a traveler and would air them down to about 6 Psi and never lost a bead do to them being on a 7" rim.

Originally posted by Abba
Whith 35 bfg I ran 10 on back 12 on front.And my Scout is not 7000.lbs Curtis.

I thought you said it weighed 6900 when Bob weighed it?

With my old 33x12.50 Coopers I'd run 8-10psi in the snow, 12psi or so in the summer.

The new 33x12.50s are stiffer.. and don't start to work until I get under 10psi. 15x8 rims on a SII.

I've run the same tires at 8psi under my Travelall, too. Amazing where that land yacht will go at 8psi.

Both rigs have onboard air, and neither have lost a bead.

On my light SII I run max inflation. That's 15psi in the Terra Tires, 35psi in the biasply "Super Thing" rubber. The one time I didn't check tire inflation was the time I blew a tire when I landed (thus, I now have only 3 of the old Super Things).

Funny as it may be, Snoopy has 12psi (front) and 9psi 9rear) 100% of the time. It also runs 38.5x14.50x15 SuperSwamper SX's mounted on 15x10s.

Why so low? Because Snoopy is light. What I do is air it down until I get a the entire tread width hitting the ground ~ if I run 35psi then it'll only ride on the center lugs.

Most trails I do have rocks and boulders, some loose dirt. I've never come close to loosing a bead.http://www.dandcextreme.com/cage4.jpg

I am the king of peeling beads!!!!!! <g>

for a while there, I was peeling a bead every time out.

I run snow at around 8psi.

Rest of the time, I run at around 12psi. Anything below that and I start peeling.

Radial Mud Rover MT's 33 x 12.50's, siped, under SSII.

We run 36" tsl swampers on a full size Bronco.
On the street we have a pressure at 32 PSI.
on the trail it varies from 32 PSI down to about 12 PSI. Last winter we ran the tires down to 6 PSI on Iron Goat trail and lost two beads. We don't go under 8 PSI any more. Never lost a bead, but we do collect lots os stuff in the beads.
But hey, we got some fun trails up here.
Ritch

lots of good answers gentlemen,just what I was looking for,different rigs with various size and make's of tires on changing terrain.
Thanks :D