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Old 04-17-2021, 11:07 AM   #1
aza
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Over inflation tire pressures during travel

2019 Entegra Anthem -- I know I should find an answer to my question in the forum but can't. My issue is that I inflate my front (steering) tires to the recommended 120 psi prior to making a trip. During the trip (in 60 degree outside air temperature) the pressure in both tires increases to 155 PSI. I can only imagine that the tire pressure at 100 degrees OAT during the summer will be close to 200. Might I experience a blow out due to overinflation?
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Old 04-17-2021, 11:13 AM   #2
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I look forward to an answer, I have same issue.
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Old 04-17-2021, 11:17 AM   #3
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Quote:
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2019 Entegra Anthem -- I know I should find an answer to my question in the forum but can't. My issue is that I inflate my front (steering) tires to the recommended 120 psi prior to making a trip. During the trip (in 60 degree outside air temperature) the pressure in both tires increases to 155 PSI. I can only imagine that the tire pressure at 100 degrees OAT during the summer will be close to 200. Might I experience a blow out due to overinflation?
What was the outside temp when you inflated the tires. For car tires each 10 degrees increase equals about 1 psi increase

And what was the altitude change?
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Old 04-17-2021, 11:24 AM   #4
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I set my tire pressure twice a year.

In June I wait for a 90 degree day and set my pressures. Then in the fall about October when it's about 50 degrees I'll set them again.

We've travelled on days that when we left home it was 110 degrees and ended the day at 60 degrees up in the Sierra mountains.

In the winter we've gone from 65 degrees down to 25 degrees.

I check my pressure every morning but don't adjust it, I just look for one tire way out of range with the others.

We go from 380 feet to about 6,500 feet and the altitude affects the pressure too.
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Old 04-17-2021, 11:32 AM   #5
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This is interesting....does your TPMS also show temperature? I read about another owner with this problem, and his turned out to be dragging brakes on the front which increased temperature and pressure of the tire.

Front wheel bearings going bad or starved for oil could also heat the front wheels.

Do you have an infrared temperature gun? You could also check temps this way.
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Old 04-17-2021, 11:35 AM   #6
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Why worry so much? There is Black vs White pavement. There is the North vs the South facing tires. There is the issue of who uses brakes and who uses downshifting. Uneven loading or different loading from stop to stop. Too many variables.
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Old 04-17-2021, 11:43 AM   #7
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You say you inflated your steers to the "recommended tire pressures". I am wondering what exactly did you mean? Do you mean that some dealer or some other coach owner recommended some pressure, or some other owner recommended a specific tire pressure. Please clarify.

Now my belief is that there is no such thing as a recommended tire pressure. To me, the only issues are the loads (weight) that the tires are dealing with, and second, the tire pressure versus loads recommended by the tire manufacturer. There is no one appropriate tire pressure. Also, it all depends on the tire size and manufacturers recommendation.

Could you clarify what you mean and how that pressure was chosen?

Gary
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Old 04-17-2021, 11:47 AM   #8
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Quote:
Originally Posted by aza View Post
2019 Entegra Anthem -- I know I should find an answer to my question in the forum but can't. My issue is that I inflate my front (steering) tires to the recommended 120 psi prior to making a trip. During the trip (in 60 degree outside air temperature) the pressure in both tires increases to 155 PSI. I can only imagine that the tire pressure at 100 degrees OAT during the summer will be close to 200. Might I experience a blow out due to overinflation?
Without the corner weights and tire size, it’s hard to say, but it seems you might be starting out a lot higher than necessary. I wouldn’t be comfortable with pressure in the 150psi range either.

As an example, a Michelin 365/70 can carry 9000 lbs at 105psi.

I’d refer to this site: https://www.rvtiresafety.net/ for a more definitive answer.
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Old 04-17-2021, 12:20 PM   #9
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60 degrees just before leaving on a 300 mile trip
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Old 04-17-2021, 12:23 PM   #10
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My Vega touch tpm does not work. Many times at spartan to repair and it can't be fixed. I purchased a monitor system on Amazon and it works great, thus alerting me to the issue
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Old 04-17-2021, 12:24 PM   #11
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120 is on the plackard in the coach, also consulted Spartan.
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Old 04-17-2021, 12:38 PM   #12
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120 is on the plackard in the coach, also consulted Spartan.
Ok, well that pressure may be unnecessary. To find out you have to have weights, and go with the heaviest side. So if you are at 8500 on the drivers side and 8900 on the pass, look up your tire size and go with the the recommended inflation for that tire/load. You might be able to lower your pressure 10-15lbs to start which will help. You have a 20,000lb front axle, but might only be carrying 16,000lbs. Could make a difference.

https://www.rvsafety.com/images/pdf/...ionrvtruck.pdf

I would also recommend manually checking your tire pressures with a good quality truck tire pressure gauge against the reading from your TPMS. Especially when you are reading 155psi. A TPMS is good for noting changes but may not be calibrated precisely or accurate enough to give reliable pressures. I might invest in a TPMS but I wouldn’t rely on it for accurate information - it would be strictly to warn of significant tire deflation.
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Old 04-17-2021, 12:40 PM   #13
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Of course the tire pressure is going to go up.
Road friction itself will increase the heat.
That is normal.
Why are you checking it while travelling?

Tire pressure should be check in the morning at Ambient outside temp.

Use your TPS as an instrument to tell you when your pressure is getting dangerously low.

NEVER ever check your tires while travelling!
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Old 04-17-2021, 12:45 PM   #14
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Anyone ever watch a "Pro" "sound" his tires at a rest area or truck stop?
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