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Tire Pressure in Rocks

Discussion in 'Rocky Mountain Region' started by Hossbaby50, Jul 19, 2004.

  1. Hossbaby50

    Hossbaby50 3/4 ton status

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    I am wondering what you rock crawlers are running for PSI in the rocks. I have been at 20psi on the last few runs but think I might go lower.

    Keep in mind no beadlocks. 15x8's with 35x12.5x15's.

    I am thinking about lowering to 15psi. How low of PSI can I go and be safe? How low can you go without sacrificing to much axle clearence.

    Does more bulge in the sidewall = better?

    Harley
     
  2. therobzilla

    therobzilla 1/2 ton status

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    Harley,

    Don't go any lower than about 17 PSI, I run mine around 20 most of the time, except when it's raining, then I run them around 16PSI, makes a big diffrence. Too low on the MTR=sidewall cuts. Trust me I have learned the hard way.

    The MTR are like all tires, one they are broken in some, they don't require lowing the air pressure as much.

    Rob
     
  3. Hossbaby50

    Hossbaby50 3/4 ton status

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    sweet, I was playing around with pressure here at the house where I have air and I went to 15 on one tire and it looked to low. 18 looked good to me. So 17 is the number then. Thanks Rob

    Harley
     
  4. az-k5

    az-k5 1/2 ton status

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    I have run mine at 15 psi on all of the trail runs in the last year or so. It works for me. I only run 25 psi on the street so 20 seems a waste to me. It might be a taller sidewall thing. I know a couple of guys running the 17" version of 37" MTR's and they say higher pressures are needed. /forums/images/graemlins/dunno.gif I know the 14FF drags a lot at 20, I can only imagine 10 /forums/images/graemlins/doah.gif
     
  5. FWP

    FWP CRS

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    [ QUOTE ]
    Too low on the MTR=sidewall cuts.

    [/ QUOTE ]

    You got that right /forums/images/graemlins/eek.gif I'm glad those days are pretty much over...
     
  6. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    I ran my TSL's at 9 psi in Moab... /forums/images/graemlins/waytogo.gif

    Rene
     
  7. desertrat67

    desertrat67 Hawk Driver

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    i run about 15 with my 38" TSl's. i don't get much sidewall flex out of these things and i have run lower, but anything under 10 and i lose the bead(16.5 rims). Normally anything lower than 15 is for sand though.
     
  8. weisel

    weisel 1/2 ton status

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    I acidently ran one of my bfg MT's at 11psi on terminator and it did alright. I saw a jeep run bfg at's at 10 once, and everytime the tire flexed, it leaked air. He had only about 5 psi when the trail was over. I don't know what to conclude about this, just posting up information.
     
  9. BadDog

    BadDog SOL Staff Member Super Moderator Author

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    Not much use, but I run my 42" TSLs with no bead locks as low as 4.5 - 5 psi and no complaints. With a cut down truggy, and the heavy carcass of the bias TSLs, I have to got that low to get them to flex and bite. Of course, then they start to squirm a bit, and I've seen the tire fold completely under the rim so that it looked like the rim was on the rocks (nose down, practically on the nose, trying to make a sharp turn).
     

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