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Tire pressures

Discussion in 'Ford F-150 Raptor General Discussions [GEN 2]' started by ME120, Apr 16, 2019.

  1. ME120

    ME120 Full Access Member

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    Just curious, what are you guys setting your tire pressures at now that the weather is changing and temperatures are warming up ?

    I had mine set for 38 psi in the winter, which worked fine. But now with temperatures rising I'm finding that after about 15 minutes of driving, they are up around 42 psi.

    I was going to drop them to 34 psi for the summer, figuring they would rise to 38-39 psi ?
     
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  2. JohnyPython

    JohnyPython Full Access Member

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    I’m running 34-35 psi.

    I noticed the psi values on the TPMS screen is not the same as actual gauge readings.
     
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  3. jzweedyk

    jzweedyk FRF Supporting Member Supporting Member

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    I also run 34-35.
     
  4. ME120

    ME120 Full Access Member

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    Yes. Thank you. I'm going to lower mine to 34 PSI, knowing that they will rise to 38-39 psi after driving for 15-30 minutes.
     
  5. Badgertits

    Badgertits Full Access Member

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    ??? Ummm, lol that’s not how it works. Cold tire pressure - meaning, regardless of outside temps before you have done any significant mileage or especially before driving @ any highway speeds, when the truck is sitting cold 24hrs, that’s when you fill to the desired psi. Once you start driving, regardless of exterior temp or the pressure you initially filled them to, they WILL heat up due to revs/friction & the TPMS readings will climb. That is normal. The recommended PSI is a guideline, depending on what you’re doing you can air up/down slightly when setting the COLD psi. If driving on sand dunes/beach cold psi should be down in high 20s low low 30s if towing or hauling or looking for better Hwy mileage you should air up to low 40s

    But in any event, if you want to adhere to factory recommended pressure, you set it to 38 after trucks been sitting for a good while, whatever pressure the tires settle at when cold (unused for extended period of time not necessarily “cold”
    As in ambient temps) is considered the “true” tire pressure. Most of the time you lose pressure over time & it’s more prevalent w/ extreme temperature swings and/or driving conditions.
     
  6. ME120

    ME120 Full Access Member

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    Good info. Thank you.
     
  7. Badgertits

    Badgertits Full Access Member

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    No worries- a lot of people
    Confused when it comes to tire pressures- the same model
    Tire can show different pressure ranges on the sidewall depending on Tire size/application, of course that has nothing to do w/ the manufacturer recommended psi usually listed on inside drivers door, and w/ trucks the correct psi can vary even more depending on what you’re trying to do.

    Next time it’s 30 degrees out & you’ve been driving on highway for a few hrs pay attention to psi- you’ll see it climb, feel the tire after stopping @ gas station - it’ll be noticeably warm. Hot air expands, so your psi will climb, even more so in hot ambient temp, but once the truck is sitting for a few hours the psi should drop back down to whatever you set it at if it was done recently.

    If you want more “stable” tire pressures less prone to temp
    Fluctuations and/or losing air during long periods of sitting or extreme temp swings try having them filled w/ nitrogen
     
  8. 10SpdsOfFury

    10SpdsOfFury FRF Supporting Member Supporting Member

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    Discount tire when I had the stock BFG’s set mine to 50psi because that’s what their computer said, the stock tires say Max 45psi) I told them fix that. Yesterday I had them do my rotation which now I have same size but Ridge Grapplers and they again set it to 50psi. The Nittos say max pressure is 65psi but even at 50psi it rode like shit. I am going to set them back to 38 in the morning when cold.
     
  9. dewalt

    dewalt Full Access Member

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    Air is 75 % nitrogen. That is enough nitrogen in my tires
     
  10. Todd H

    Todd H Member

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    Anything below 38 I get lights in my Gen 1 so I run 38 on road and 25 in the desert.
     

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