done alot of wheeling but have never wanted to air down to much and have it pop off the rim. what do most of you guys run on your trucks? also i know whats good for one turck may not be good of another. i tend to be more of the big tow truck in my group bringing extra gear in and towing out my buddies in there smaller trucks well they play around so if anyone running a bigger truck can input into this that would be great. i'm running a 1993 F250 7.3 lifted on 37" super swampers
thanks guys and hope to get out there and do some trails with a few of you guys soon.
Super Swampers are really stiff, friend of mine runs his 33"x15"Boggers at 8psi and they don't even squat. I have a set of 33" TSLs on 15" rims and I run them at 9-12 psi depending on what I'm doing....never blown a bead. If I were you I would start at around 14-15psi and see how that goes....I'm fairly certain you'll want even less though.
I'm in heavy diesel does that change anything? Or is it's still just psi and related to the wight anyways? Read all this stuff about guys running 2-12 psi but just feels low to me.
The weight of the rig will effect how much air is needed to support it.
A 3000lb rig with the same amount of sidewall bulge will need about half the psi as a 6000lb rig will.
Measure the height of you sidewall at street psi.
Divide by two.
Deflate one rear and one front till there almost touching the ground.
Re inflate the tires until you get half the height back.
The fronts will require more psi then the rear. On a diesel it might be as high as 50% more.
I run 18 psi on and off road, I`v chaulked my tires and 25psi rear and 28psi front is my sweatspot. By running 18psi I can quickly jump up 10psi for a long highway trip or air down 10psi for the trail if needed. The good thing about doing this is when you see that trail off the side of the road that looks interesting, you can just do it.
I rarely air down and run 18psi on all trails, if by chance I need that extra footprint then I will run 8psi rear and 10psi front.
I also run what I would call a Redneck Beadlock, a 12.5'' wide tire on a 15'' by 7.5'' wide rim.
ok sounds good just rebuilding my axle this weekend and put my rad back in i had to fix then i'll try a few tests airing down in the driveway see what she likes. my buddy i'm heading out with once my trucks ready got tire deflators for chrismas and just set them to 16 psi so kinda hoping that will work for my truck too. do you guys use tire deflators, a tire gauge or just go by the look of the side wall when your out there? like the redneck beadlockers too!