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My dealer inflated my Dunlop At20's to 55 psi!

Discussion in '5th Gen 4Runners (2010-2024)' started by RandyRandyRandy, Apr 16, 2022.

  1. Apr 18, 2022 at 12:26 PM
    #61
    Trdorp22

    Trdorp22 New Member

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    Mine came at 55 psi as well from the dealer. Realized it a few days of driving later and aired down to 35 psi.. that’s where I find a happy medium with all my tires..
     
  2. Apr 18, 2022 at 12:38 PM
    #62
    Doubleduty

    Doubleduty Life is better on the mountain

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    Lets not forget that all tire pressures increase significantly as they heat up.
     
  3. Apr 18, 2022 at 2:16 PM
    #63
    08TXRunner

    08TXRunner New Member

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    I can't believe this thread is three pages long...
     
  4. Apr 18, 2022 at 2:34 PM
    #64
    Thatbassguy

    Thatbassguy New member? Really??

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    I can't believe people still think they should run the maximum inflation on the tire instead of the pressure specified by Toyota (obviously not with different size/load range tires). But, here we are. o_O
     
  5. Apr 24, 2022 at 7:23 AM
    #65
    MAXIM

    MAXIM New Member

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    That is correct and Boyle's law of physics explains this. About "significantly increase" is mostly subjective. As rule of thumb for 10 degree increase in ambient air temperature causes 1 PSI increase in tire pressure.
     
  6. Apr 24, 2022 at 7:41 AM
    #66
    Doubleduty

    Doubleduty Life is better on the mountain

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    WOW! That temp goes up quickly then. Might explain why after checking my tires before going to the grocery store, they were 5 lbs higher when I returned. I would say that's " significant "
    Please keep the physics coming.
     
  7. Apr 24, 2022 at 9:31 AM
    #67
    ElectroBoy

    ElectroBoy Ad astra

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    Another fun thing to keep in mind is that atmospheric air pressure varies inversely with altitude. So for every 1000 feet of elevation gain the atmospheric pressure drops approximately 0.5 PSI, and your tires internal pressure will also increase by about that amount.
     
    LandCruiser likes this.
  8. Apr 24, 2022 at 9:40 AM
    #68
    RandyRandyRandy

    RandyRandyRandy [OP] New Member

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    As a bookend to this thread, this past thursday I replaced all of the oe tires with Falken Wildpeak AT3W's. Look great! The ride is a tad less smooth but nothing significant. America's tire gave me a trade-in amount for the oe's.
     
    Thatbassguy likes this.
  9. Apr 24, 2022 at 9:46 AM
    #69
    Spare Parts

    Spare Parts New Member

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    What PSI did they set them to?
     
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  10. Apr 24, 2022 at 10:06 AM
    #70
    RandyRandyRandy

    RandyRandyRandy [OP] New Member

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    55......
     
  11. Apr 24, 2022 at 10:07 AM
    #71
    RandyRandyRandy

    RandyRandyRandy [OP] New Member

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    just kidding. 35. I set down to 32 next morning when tires cold (or as cold as they can be in California).
     
  12. Apr 24, 2022 at 10:09 AM
    #72
    Spare Parts

    Spare Parts New Member

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    :benchpress:
     
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