Tire Pressure

Discussion in 'Questions From New Drivers' started by farmerjohn64, Jul 1, 2020.

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  1. farmerjohn64

    farmerjohn64 Road Train Member

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    Question 147,869:

    Hi,

    May someone tell me the idea pressure for my tires? Any tips, warnings, etc? Much appreciated.

    Best regards, John
     
    farmerjohn64, Jul 1, 2020
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  2. gentleroger

    gentleroger Road Train Member

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    Generally 120 steers, 100 drives, 100 trailer.

    Some prefer 110 drives.
     
    gentleroger, Jul 1, 2020
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  3. farmerjohn64

    farmerjohn64 Road Train Member

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    Appreciate it, I just picked this up to check 6BB3F55F-B8DD-4CFE-89F2-0EE00179C743.jpeg
     
    farmerjohn64, Jul 1, 2020
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  4. not4hire

    not4hire Road Train Member

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    [​IMG]
     
    not4hire, Jul 1, 2020
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  5. D.Tibbitt

    D.Tibbitt Road Train Member

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    120 steers 110 on drives and 110 on trailer. Is what i run.
     
    D.Tibbitt, Jul 1, 2020
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  6. PE_T

    PE_T Road Train Member

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    120 on steers only if the sidewall states 120 COLD psi. Most truck steer tires probably have the standard 110 COLD psi printed on the sidewall.

    Technically, the COLD psi printed on the sidewall is the maximum you should have in it while the tire is cold, say, has not been driven for over 4 hours and has been away from direct sunlight preferably. If you have a standard 110 COLD steer tire, you can use 100 to 110 psi cold. Go with 110 cold if you haul heavy most of the time. Go with 100 if you haul mostly light loads. Otherwise, you might experience over-inflation tire wear.
     
    Last edited: Jul 1, 2020
    Reason for edit: Spelling
    PE_T, Jul 1, 2020
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  7. Razorwyr

    Razorwyr Road Train Member

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    Read the tire, every tire will have the mfg suggested pressure. Depending on the load range/type/size/mfg it could be a huge difference and what is legal for one tire may not be for another.
     
    Razorwyr, Jul 1, 2020
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  8. otherhalftw

    otherhalftw R.I.P.

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    Check your tire guage, most of them are not calibrated well if at all. It will give you a decent "ball park" reading though.
     
    otherhalftw, Jul 1, 2020
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  9. uncleal13

    uncleal13 Road Train Member

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    Not correct. What is printed on the side of a class 8 truck Tire is the maximum weight the tire can carry for a given air pressure.
    Or conversely it means the minimum pressure for a given load on the tire.
    The absolute maximum pressure is stamped on the rim. The tires can handle way more pressure before the rim folds over.
     
    uncleal13, Jul 1, 2020
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  10. PE_T

    PE_T Road Train Member

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    I had this discussion in the past somewhere in this forum. The truth is that while the tire does not specifically state a maximum psi, it is “understood” that way from load and inflation tables, say, from Michelin. If a Michelin steer tire has 110 psi stamped on the sidewall, then the load and inflation table for that tire will ONLY give you psi readings up to that point. See image below. That’s the tire size I currently have on my trailer and steers.

    9B2EC272-F998-45C1-91C6-377056B24C51.png

    Load & Inflation Tables | Michelin Truck
     
    PE_T, Jul 1, 2020
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