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Old 05-12-2018, 10:27 AM   #11
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Originally Posted by buvens View Post
I have a Chevy 1500 with tires that say 44# psi at so much load and a trailer with
6 ply tires that recommend 50# psi

Was just curious what pressures I might see driving on hot highways in 90 degree weather?

Took the truck to fill it up with gas a couple of days ago and without the trailer the tires were running 49-50# psi.

Checked the truck tires the next morning and they were all at 44# psi.

Figured with trailer on the highway it would go some higher.

Was wondering what others experiences are?

Maybe even temperature also. Don't remember what tire temps were right now.

Always set your tire pressure when the tire is "cold". There is no reference to a certain temperature for the meaning of cold. That reference is made to mean; When the tire is at ambient air temperature of the surrounding air. If it's 90 degrees outside and the tire has not been in use (cold) then set it to the correct pressure that is required....in your case, 44 for the truck and 50 for the trailer. The next day, you might have travelled to a location where the ambient temperature is 70 degrees when you wake up and before you start travelling. Adjust the air pressure to 44 psi for the truck and 50 for the trailer.

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Old 05-12-2018, 02:58 PM   #12
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Originally Posted by buvens View Post
Thanks for all the info.
here is what I saw.
On the 44# psi truck tires in stop and go on the interstate I saw up to 57#psi and up to 129 degrees. Mainly higher on front tires.
Once rolling around 55mph they cooled down to 51# psi and about 99 degrees.
Trailer tires got up to 57# psi and 105 in traffic and 97 once we were traveling.
Was interesting just seeing what they did on a 90 degree day.
Now on mobile phone so dont have speadsheets for temp/ pressure at hand.
But the pressure rising is not in line with the temperatures.
So I think you have sensors screwed on the outside on valves. This gives temp somewhere between in an outside tire temp.
At the stop you probably measured higher temp and pressure because yust after braking , wich heat is transported trough the rimms to the tire inside.
When I am on my handicapped laptop, I will give a tabel of pressure for temp.

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Old 05-12-2018, 06:13 PM   #13
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Sailuns on the 5er set at 110psi cold will run 125 - 129psi and generally around 100F when going down the highway.
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Old 05-27-2018, 09:05 AM   #14
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All tire manufacturers publish a load VS pressure chart. The pressure (cold) you put in depends on load. The best way to determine this is to get weighed. You need the weight on each tire so if you weigh the front axle you divide by 2 to get the individual tire load. Same with the rear. If you have a Dully assume that each tire is 1/4 the axle load. Same for the trailer. Knowing the load on the tires you can go to the chart and read the cold pressure you need. If you are close to the max lead on tires this will probably be the max pressure stamped. Also be aware that the max rating for a tire will be lower for each tire on a Dually axle.

Don't worry that the pressure goes up after driving even a short distance, this is normal.

I hope this helps.
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Old 05-29-2018, 10:32 AM   #15
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Tires Pressures

Truck's recommended tire pressures for max load should be set, based on 70 degrees F, for most accurate setting. We have a 5th wheel and dually, with TPMS on all tires. Tire pressures on the truck will rise as much as 12 psi when towing in 90 degree weather. 5th wheel tire pressures will rise as much at 18 psi, when it's hot. Pressure and temperature rises are expected by the tire manufacturers. If you are still concerned, go to the website for your tires, and ask the experts.
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Old 05-29-2018, 10:48 AM   #16
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Thanks for everyone's replies.

I had just put on the TPMS on my TV and trailer and was wondering what to expect.

Now that I have used it awhile I know better what to expect.

Probably be higher with the summer coming.

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