Do you guys air down offroad? What PSI for stock tires?

[VelociRap]

Title says it all. I airdown in my Jeep but that’s rock crawling, not high speed bombing.

Thanks,

i do 32/30 F/R stock wheels and stock tires.

 

[dewalt]

Load and pressure chart tells you how low you can go for road running at a tires rated speed. So it is starting place for an informed decision. I think 12.5 17 it is 25 psi. I guess you can wing it and see what happens

 

[Halo Raptor]

I go 25 front and back. Guys I run with go a bit lower. My truck seems fine at 60-70 mph in the desert at 25psi

 

[onthebrake]

Title says it all. I airdown in my Jeep but that’s rock crawling, not high speed bombing.

Thanks,

During Raptor Assault school last November 2019, we ran 32 Front and 28 Rear. We were rock climbing, in the snow and on the street with that air pressure. From 2 mph crawl to 60 mph with those pressures. Stock BFG's, stock trucks of course.

 

[Sunchild714]

20psi

 

[amREADY]

The 32, 28 Rap assault makes sense for an unloaded truck and max traction comfort.

I'm pretty new to the truck, but started with 38 all around as a benchmark. Got me where I wanted to go, but needed speed on washboard or the truck felt terrible.

Went to 36, 34 and what a difference. Mix of gravel, loose and sharp rock, lower and higher speeds and some muddy backroads but not deep.

With some weight in the back, ran about 33 all around. Felt like a great compromise pressure for a wide variety of terrains and speeds.

Going down from there will give you better floatation and Rock crawling, but sacrifice of some steering mushiness at speed and probably a higher chance of sidewall puncture in sharp rock or blowing the bead on faster wheeling. Just guessing, need to play with it more.



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[jzweedyk]

Actually, in my opinion, a lesser chance to puncture a tire when aired down. Think of a balloon, when highly inflated you can ***** it with a pin and pop it easily. A mostly deflated balloon will just give way and it will be a lot harder to puncture.

Blowing a bead can be done, but it usually takes a lot of "work" to do it. Wedge a tire and twist it, is one good way. But I know guys that run 8 psi (on a Jeep) on a stock rim and have never blown a bead. I have never blown a bead, but I have gotten a stick wedged in the bead, and I run 10-12 on my very heavy Jeep, and 12 - 14 on the Raptor.

 

[amREADY]

Actually, in my opinion, a lesser chance to puncture a tire when aired down. Think of a balloon, when highly inflated you can ***** it with a pin and pop it easily. A mostly deflated balloon will just give way and it will be a lot harder to puncture.

Blowing a bead can be done, but it usually takes a lot of "work" to do it. Wedge a tire and twist it, is one good way. But I know guys that run 8 psi (on a Jeep) on a stock rim and have never blown a bead. I have never blown a bead, but I have gotten a stick wedged in the bead, and I run 10-12 on my very heavy Jeep, and 12 - 14 on the Raptor.

Good comments, thanks.
I travel on 'shot rock' sometimes. It is killer on bulging sidewalls. Have found some airing down reduces the balloon effect and tread chunking. But as it deforms more over the sharp rock, gets more sidewall cuts.

Shot rock is typical of West coast logging roads where sharp granite rock ballast is used from blasting. Often thin or no gravel topping is used or remains after a few years. Speed further compounds the problem.

Silt, clay, mud, snow, river rock, sand and some types of blast rock are no problem at all. Very forgiving. Some rock cleaves at 90 degree planes and even that is fairly forgiving. But some is sharper than that.



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[Sgt Beavis]

So, my Wrangler runs Falken AT3W 35s in 17” wheels. When crawling, I run them at 20psi front and rear. I have a dual ARB compressor that can reset a bead if needed and of course, they get me suited up quickly.

 

[jzweedyk]

Good comments, thanks.
I travel on 'shot rock' sometimes. It is killer on bulging sidewalls. Have found some airing down reduces the balloon effect and tread chunking. But as it deforms more over the sharp rock, gets more sidewall cuts.

Shot rock is typical of West coast logging roads where sharp granite rock ballast is used from blasting. Often thin or no gravel topping is used or remains after a few years. Speed further compounds the problem.

Silt, clay, mud, snow, river rock, sand and some types of blast rock are no problem at all. Very forgiving. Some rock cleaves at 90 degree planes and even that is fairly forgiving. But some is sharper than that.



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You are right. I do quite a bit of off-roading in the southwest. I have cut sidewalls but not gone through so as to lose air. Some of it is just luck, the rock being in the right angle, you hitting it just right, and so on. A small cut is really not an issue in a really good off road tire, like the BFGs. Also the KO2s on the Raptor are C range, which means their sidewalls are more pliable and again, in my opinion, less likely to get cut. Those people who put D & E range tires on the Raptor are not making their off road ability any better.