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Question for those that air down offroad...

Discussion in 'Wheels & Tires' started by Cement, Apr 13, 2019.

  1. Apr 13, 2019 at 12:10 PM
    #1
    Cement

    Cement [OP] ...

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    What do you consider the minimum safe air pressure to run when offroad with the following combo:

    OEM 18" SR5 Off Road Wheels + 295 70 Toyo Open Country AT2s?

    I picked up a set of Staun's which come factory preset to 18psi. Wondering if that's good to go or if I need up reset them to something higher. Reeeeaaallly dont wanna be rolling a tire off the wheel out in the middle of nowhere.

    TIA
     
    CaptSpaulding likes this.
  2. Apr 13, 2019 at 1:28 PM
    #2
    the_midwesterner

    the_midwesterner New Member

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    None, yet....
    So... popping a bead can technically happen at any time. It’s just more prone to happen while aired down, since there is less outward pressure helping keep the bead seated. You hit a curb hard enough fully aired up, I’m willing to bet that tire ain’t going to survive. See my point?

    As such, I generally don’t recommend sub 15ish pressure without beadlocks, however this really depends on your sidewall size and driving style. Since you have a 70 series sidewall, you “should” be fine at 18psi pressure. That is what I run on my 315/70s. Just be mindful of when you come to situations in where your bead may be compromised and correct accordingly. Now if you are the point and floor it kind of guy, maybe safer to increase your air down pressure. Also, your terrain will come into play. If you’re doing more crawling type of wheeling, then lower pressures are fine. If you just want a softer ride, may be safer to stay higher.

    Hope this helps, but there isn’t a run X pressure because it’s literally the best type of pressure. Whole bunch of variables to consider.
     
    Last edited: Apr 13, 2019
    ColoradoTJ, 15whtrd and CaptSpaulding like this.
  3. Apr 13, 2019 at 1:51 PM
    #3
    Cement

    Cement [OP] ...

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    Thanks Luis, all understood. I've aired down and wheeled for years, but never on a wheel this narrow (OEM is 8" right?). I'm sure 18psi is good to go, especially with how I drive (slow, careful, rather see the sights than blow past em...). Just wanted some confirmation. Thanks again.
     
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  4. Apr 13, 2019 at 2:09 PM
    #4
    joonbug

    joonbug °°°°°°°°°°

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    If I’m crawling I usually go 15-20. If I’m going high speed, usually around 25.
     
  5. Apr 13, 2019 at 2:10 PM
    #5
    CaptSpaulding

    CaptSpaulding ...ain't nothin but nothin

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    Rock Warrior wheels are 8" wide, I currently run 35x12.5x17 BFG KO2s, which are load E rated and target 16psi for most trails. I was in Mohave driving pretty hard for 4 days without issue a few weeks ago. I did scuff the faux-bead lock ring on the rocky trail up to Fort Piute in 1 spot, otherwise all good.
    Costco wouldn't mount the tires to the wheels (even though I purchased the tires there) because the tire width minimum is 8.5". Thankfully, I trust our fellow forum members running the same combo so I went to Les Schwab who did all the work, I including an alignment. I was told with the E rated tire, you can go as low as 12psi before slipping a bead...too low for my comfort though.

    Just my experience and input, I could be pushing my luck everytime
     
  6. Apr 13, 2019 at 2:13 PM
    #6
    JMB

    JMB Not new, just a little old.

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    Same size tires and 8" stock rims. I'm always at 18 psi on the beach, never had a problem.
     
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  7. Apr 15, 2019 at 8:23 AM
    #7
    Cement

    Cement [OP] ...

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    Update: I ran mine down to 15psi this weekend with no problems. Over the 20 mile run, the terrain included lots of sharp desert rocks, sand, a few water crossings, steep ups and downs with several off camber turns in between. I don't think I'll push any further down than that, unless stuck in the sand or mud. Otherwise, I think all good.

    viber image 2019-04-14 , 14.50.06.jpg

    PS: Loved having that front camera and FRAC harness. Helped some in situations like the above but REALLY helped when climbing. No more seeing only sky and trusting the trail didn't turn out from under me.
     
    Last edited: Apr 15, 2019
    OR18TRD, JMB, Spitfire and 4 others like this.

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