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  1. #1
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    Default Tyre Temperatures

    Does anyone know what the temperature of an AT 265/60 R18 tyre should be at 2.2.Bar travelling at 120kmh with the ambient temperature being 25 deg C ?

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    Default Re: Tyre Temperatures

    Eish, Google. Depending on road conditions, road heat, weight, load.....
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    Default Re: Tyre Temperatures

    Quote Originally Posted by hunter26 View Post
    Eish, Google. Depending on road conditions, road heat, weight, load.....
    I Googled this add-infinitum - found nothing

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    Default Re: Tyre Temperatures

    Last edited by 4ePajero; 2021/05/10 at 04:57 PM.
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  7. #5
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    Default Re: Tyre Temperatures

    I don't have that size tyres but as a rule the TPMS shows around 30 deg @ 25 ambient. On warm days like 35 deg plus I have seen the TPMS indicate 45 deg plus! I had 265/75/R16 GY Wranglers.
    Quote Originally Posted by JB15 View Post
    Does anyone know what the temperature of an AT 265/60 R18 tyre should be at 2.2.Bar travelling at 120kmh with the ambient temperature being 25 deg C ?
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  9. #6
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    Default Re: Tyre Temperatures

    I don't have the same size tyre as you specified on any of my vehicles but I can give you an idea of the temperatures I normally get when traveling.
    On my Disco 2 I have 245/70-16 tyres and 235/75-15 on the Xplorer caravan. I use a digital infrared thermometer to check both tyre and hub temperatures at all stops as an early warning to an under inflated tyre or wheel bearing problem. The normal temperature I get is 60c but if the road and ambient are high it can go as high as 70c. These temperatures are with the recommended tyre pressure for both the Disco and the caravan tyres. When I'm not towing and the tyre pressures are set for that configuration the temperatures are also normally at 60c.
    Play around with checking your tyre temperatures when driving your normal routes with the pressures set as per the vehicles specification. This will give you a good base line to see what happens when you increase or decrease pressures.
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  11. #7
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    Default Re: Tyre Temperatures

    Quote Originally Posted by Paul#25 View Post
    I don't have the same size tyre as you specified on any of my vehicles but I can give you an idea of the temperatures I normally get when traveling.
    On my Disco 2 I have 245/70-16 tyres and 235/75-15 on the Xplorer caravan. I use a digital infrared thermometer to check both tyre and hub temperatures at all stops as an early warning to an under inflated tyre or wheel bearing problem. The normal temperature I get is 60c but if the road and ambient are high it can go as high as 70c. These temperatures are with the recommended tyre pressure for both the Disco and the caravan tyres. When I'm not towing and the tyre pressures are set for that configuration the temperatures are also normally at 60c.
    Play around with checking your tyre temperatures when driving your normal routes with the pressures set as per the vehicles specification. This will give you a good base line to see what happens when you increase or decrease pressures.
    There is probably quite a big difference between temps measures on the outside circumference as you are doing and tmeasuring the air inside a tire as a TPMS does (which I suspect is what the OP is using).

    I have only once ever seen 60 on my TPMS, and that was on a very hot day in Namibia on a heavily loaded vehicle.

    To the OP, I generally expect tire temps (measured by TPMS) to run in the region of 15-20 degrees above ambient, depending on load. I have not noticed size being a large differentiator, but load definitely is. And I suspect the difference between ambient and tire should probably be expressed as a percentage rather than an absolute.
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  13. #8
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    Default Re: Tyre Temperatures

    Just drove from Pta to Limpopo. Outside temp was 26 deg, tyre temp 30 deg. After a 10 min stop I noticed the tyre temp has risen to 45 deg.
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    Default Re: Tyre Temperatures

    There is so much to factor in.

    I have sensors with pressure and temperatures.

    Driving with one side in full sun makes a huge difference, to tyres on the one side.

    Even driving on the white painted line, that side the temperatures will be lower than the other side, after a while. tried it just to see if it made a difference, and it did.

    Even a strong wind from one side will increase the pressure and temperature on the one side.

    Altitude makes a difference.

    weight, load, speed, road conditions, new tar (dark) vs old tar, hot tar in the sun, rough stones tar vs smooth tar, etc, etc.

    lower the pressure the hotter it gets.

    the back warms up more than the front, especially if loaded. which increases the pressure.

    For example:- my 285 BFG land-cruiser

    • cold 25 deg in the garage all 2bar. at sea level.
    • after driving 10kms at 25deg; 2.4 bar, temp 40deg on the sensor. slight difference on each side due to side gusty wind
    • after arriving at the bottom of sani pass on tar, in snow 0deg, tyre temp 20deg and 1.4 bar.
    • near the top of the pass, at -6deg, 0.6 bar. driving in virgin new snow foot thick, first 4x4 up.
    • back on the coast. at 28deg on the freeway it was back to 2.6bar. and tyre temp 45deg.


    and that is why pressures should be checked when "cold" in the shade and not after driving a few kms.
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    Default Re: Tyre Temperatures

    I have the same tyres and can see 45C on long highway trips at about 25C ambient.

    they are about 2.3bar at 20C.
    Dont take anything I say as actual advice or fact. I dont.

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    Default Re: Tyre Temperatures

    Quote Originally Posted by 4ePajero View Post
    The 4PSI rule caters for all the variables.

    Try it, it works.
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    Default Re: Tyre Temperatures

    Quote Originally Posted by JB15 View Post
    Does anyone know what the temperature of an AT 265/60 R18 tyre should be at 2.2.Bar travelling at 120kmh with the ambient temperature being 25 deg C ?
    What tyre and how much weight? A P spec tyre would quite possibly run warmer than a LT spec tyre. The latter has got a more sturdy construction and less tendency to bulge, given the same conditions. Hence it would run cooler.

    Drive for 20 minutes and check by hand, if the tyre is warm to the touch, you are good. If it's hot, like a lot warmer than your hand, it's not good anymore. This works for most types and sizes of tyres.
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    Default Re: Tyre Temperatures

    My Prado 120 always runs at 37 to 39 measured with tmps. Funny, the tire closest to exhaust always runs hotter. Or it's something else...

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