Tire pressure and temps while towing

http://blog.goodsamcamping.com/2013/08/rv-tire-blowouts-increase-as-temperatures-rise/ I run 10 lbs below recommended.

Macman83 wrote:
Wow. I will try to respond to the OP and answer his question.

I run the TST system, and set my G614 Goodyear tires at 80psi. On average, my tire temps will run 5 to 10 degrees above the outside temp, and the pressures will go up 8 to 12 psi after an hour of driving. I have also noticed that the temps are considerably lower than the temp of the rim and tire when taken with my IR temp gun. I have seen as high as 115 degrees, and 97psi when running on a hot day through the Oklahoma panhandle. This is all with a 2013 Voltage that weighs in at 16,800 lbs., with 3 axles.

Hope this helps.

80 psi is way too low on those tires- your tires are constructed and designed to run at a much higher cold psi. They will run cooler and last longer if you run them at 100-110. Low tire pressure causes a tire to run a lot hotter and just a few pounds makes a significant difference. On the G614 running them like you are you are going to start to have tread separation early and when they go it is ugly and expensive.

If your wheels are designed for a max psi of 80 you should switch tires and go with a the Michelin XPS. If your wheels can handle 110 psi you should pump those tires up for best results.

Plan to change the Goodyears out at four years- Have run them on several trailers and they are great for four years. At five they come apart regardless of how many or how few miles you have on them.

Wow. I will try to respond to the OP and answer his question.

I run the TST system, and set my G614 Goodyear tires at 80psi. On average, my tire temps will run 5 to 10 degrees above the outside temp, and the pressures will go up 8 to 12 psi after an hour of driving. I have also noticed that the temps are considerably lower than the temp of the rim and tire when taken with my IR temp gun. I have seen as high as 115 degrees, and 97psi when running on a hot day through the Oklahoma panhandle. This is all with a 2013 Voltage that weighs in at 16,800 lbs., with 3 axles.

Hope this helps.

tinner12002 wrote:
I have also noted on both trailers I have towed with the TPMS system on them that the curbside tires will run about 3-4 psi and 5-8 degrees warmer than do the drivers side tires and that's based on starting with 80psi all the way around.
I did contact Maxxis on this and all they could tell was that the tire was designed for increased pres and temps and as long as I didn't exceed the weight rating of the tires I shouldn't have any issues.

Maxxis tire tech line isn't much help where tires on a trailer are concerned. This is where a good experienced truck tire dealer has more hands on experience of what works best vs what works on paper.
Anyhow I've seen my LT235/85-16 E tires on my equipment trailers running max loads in 100+ degree outside temps go as up in the 90-92 psi range when on a long run on the interstate. Even though the ST has those rounded flexy sidewalls it may run about the same psi gains. I have no idea of my tire temps.

I have also noted on both trailers I have towed with the TPMS system on them that the curbside tires will run about 3-4 psi and 5-8 degrees warmer than do the drivers side tires and that's based on starting with 80psi all the way around.
I did contact Maxxis on this and all they could tell was that the tire was designed for increased pres and temps and as long as I didn't exceed the weight rating of the tires I shouldn't have any issues.

My tires call for a pressure of 123 PSI which is what I run. I set the TPMS sensors to alarm at 130 psi. In 5,000 miles of usage I've not had an alarm yet. I do routinely monitor them temps and look for major variations between tires. I noticed right after I got the unit that the tires on the rear axle were running hotter than the from axle. I backed off the setting on the brake controller from 6 to 5 and now all 4 tires typically run the same temp ranges. YMMV.

WOW, that is a lot of thinking. I adjust the pressure before I head out in the mornings and have never had a problem before I set down for the evening. Yes the pressure increases when the tempos are hotter, but under normal circumstances that would not cause an alarm to go off.

To answer this question right I have to write about the ST/LT thing a little.
ST tires are calculated in their maximum load for more deflection.
This cources more heat production so warmer inside tire temperature.
But you can also give the tire a pressure a LT tire would need for the same load, so it gives lesser deflection and so lesser heat production.
This all is to set the pressure on your TMPS.
Then for colder outside temperature you need to set the lowest pressure before alarm to the pressure belonging to coldest outside temperature you asume to experiënce in your suroundings.
Then you have to set the highest pressure for alarm to the pressure belonging to boiling point of water so 100degr C/ <> 200 degr F.
This temperature the inside tire can get incidentially by severe braking. Then the heat of the brakes is transported trough the rimms to the tire inside. This can happen when descending in the mountains and using the brakes to often, and then its anoing and not good for your concentration if an alarm keeps going off.
the tire and valves can stand this higher pressure , they are tested for that and even testing standards for that.

If you give data of trailer and tires I can calculate the needed pressure and give the pressures the tires will have at coldest and at hottest, so you can set your borders to that.

The TST system that we have recommends setting the alarms for 20% over and 10% under for the pressures. For ours the rear pressure is set to 80psi and will alarm at 72 for a low and 96. The front pressure is set at 65psi and it alarms at 59 or 78 for the high.
The high temperature alarm was factory set for about 165 to 170 degrees F, which I did not change.
Only once did we get a high pressure alarm, and that was while driving in the south, in summer. According to IR temp gun, the temperature of the road was about 125 degrees F

Ken

The tire pressure on my truck sure changes from summer to winter. The only sensors I have is built-in with the truck system. I get occasional alarms in the winter months before they warm up some going down the road. These alarms are not adjustable for me as far as I know.

If I keep getting low pressure alarms I usually go ahead and re-fill to bring up the air pressure.

Roy Ken