What psi do YOU air down to?
- Thread starter Bijan
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i dont think they make that size duratrac in P, only in LT.
anyways i dont know if i am doing it wrong but the people i went with told me to air down to 19-20, i have P rated tires and not LT. not sure how much of a difference that makes. (265/70/17 cooper at3)
KidVermicious
New member
Don't overthink it. 20PSI is a good place to start. Adjust up or down as you feel comfortable/safe and the terrain dictates. If your teeth are in your lap you know you can let some more air out, if you blow a bead you know you went too far down.
Makes a huge difference. I wouldn't go below 25 PSI unless you like pinchflats.
Bijan
New member
Yea I am leaning toward that myself.
nevada
Senior Member
there are quite a few variables. tires, vehicle weight, terrain etc..
for my 85 4runner on 35" radials, I drop down to 10 psi. that seems to give me the best traction, and no blown beads.
for my truck on big bias ply tires, I drop to 5psi, and then adjust(down) as the day/terrain calls for it.
the larger the tire, the further down you can, and have to go. for the 285, I think 12-15 would be as low as I would go.
it also depends if you have a dependable means to air back up....
for my 85 4runner on 35" radials, I drop down to 10 psi. that seems to give me the best traction, and no blown beads.
for my truck on big bias ply tires, I drop to 5psi, and then adjust(down) as the day/terrain calls for it.
the larger the tire, the further down you can, and have to go. for the 285, I think 12-15 would be as low as I would go.
it also depends if you have a dependable means to air back up....
BeaterToyota
New member
My more recent 36x12.50 and 37x12.50 on 8" rims I've always dropped to about 8-10.
My older 31x10.50 and 32x10.50 on 8" rims I used to drop to 10-12.
In 23 years of four wheeling (the same truck the whole time) I only lost one bead with the 32s and one with the 36s.
My older 31x10.50 and 32x10.50 on 8" rims I used to drop to 10-12.
In 23 years of four wheeling (the same truck the whole time) I only lost one bead with the 32s and one with the 36s.
BlackWorksInc
New member
I run my 33" LT Nitto Terragrapplers at 46psi road pressure and 18psi off-road. 18 has been pretty good for most everything so far, I haven't experimented with anything lower yet since I've had good results with that pressure; if you're running LT's 18~20psi is a good starting point, if you're running P-rated tires I wouldn't go lower than abouut 22~24psi.
Word on the street is the Staun deflators are where it's at..
I've used them once, borrowing them from a buddy. Dropping all 4 corners simultaneously is a nice time saver.
Last time I went out I just used the inflator attachment with built in gauge from my Viair 400P compressor set and used that to air down. Didn't take MUCH longer than my buddy with the Staun's, and you just have to pay a little more attention to the gauge.
KidVermicious
New member
Yup. Love mine. These others are better though, the same design but you can adjust them on the fly and start them manually if your tire pressure is too low to start the deflater automatically. A buddy has a set and they're better than my Trailheads in every way.
Automatic Tire Deflators PRO - 4wheelair.com
BlackWorksInc
New member
I run Staun's deflators, they work great and after setting them drop down to 18psi pretty damn reliably.
Pricier than than the Staun's I bought, but I am digging the indexed threads; that's pretty damn cool.
Pricier than than the Staun's I bought, but I am digging the indexed threads; that's pretty damn cool.
Andy in Pa
New member
My rule of thumb with airing down is similar to what others have said. You should be fine going down to 15psi, but I have seen some 33x12.50-15 duratracs get cut sidewalls when in the rocks. They were typically on Jeeps though. If your using a factory rim or a 7-8" wide rim, you should not have to be too concerned about blowing a bead at pressures down to 10psi. I have 295 75 16's on my 1999 T4r, and they seem ok in the rocks at between 10-15 psi. I run a different kind of tire though. I would air down to 20, see how they flex/grip rocks and such, and maybe drop it to 15-18psi after lunch and see how they work. It does take some experimenting, and may change again as the tires age.
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