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Old 11-19-2020, 12:47 AM   #1
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Brand: Thor Motor Coach
Model: ACE 30.3
State: California
Posts: 36
THOR #17673
TPMS - Ignorance is bliss?

Hi All,
I just added an RVI brake and TPMS system.

My the yellow sticker has my recommended tire pressure at 82 for all tires, front and back.
I was stunned at the pressure rise while driving on the freeway. BTW - It was about 80-85 degrees outside.

Rather than hijacking another thread, I was hoping to get some feedback on what is a normal rise in pressure.
Thanks All!
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Old 11-19-2020, 01:06 AM   #2
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Brand: Thor Motor Coach
Model: Miramar
State: Michigan
Posts: 3
THOR #20386
Quote:
Originally Posted by GordSanClemente View Post
Hi All,
I just added an RVI brake and TPMS system.

My the yellow sticker has my recommended tire pressure at 82 for all tires, front and back.
I was stunned at the pressure rise while driving on the freeway. BTW - It was about 80-85 degrees outside.

Rather than hijacking another thread, I was hoping to get some feedback on what is a normal rise in pressure.
Thanks All!
Air pressure in a tire will change 1 psi for every 10 degree of temperature change. That is why it is always best to inflate to the recommended pressure when the tires are cold.
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Old 11-19-2020, 01:10 AM   #3
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Brand: Still Looking
Model: Newmar Bay Star Sport 300
State: Alabama
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THOR #6826
When I first got mine a number of years ago I had the same reaction. Start at about 85 and see maybe 110-115 after driving on the interstate in summer. Seems about the same on all 6 so I donít worry about it. My primary interest it to note any sudden drops and I donít really care a lot about the number. That said, it does seem to be what really happens! Who knew?
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Old 11-19-2020, 02:28 AM   #4
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Brand: Thor Motor Coach
Model: ACE 27.1
State: Florida
Posts: 5,205
THOR #7035
On my ACE that 82 PSI at 70 degrees will go over 100 psi on hot Florida interstates. I have my alarm set at 105 psi.
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Old 11-19-2020, 04:46 AM   #5
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State: Washington
Posts: 409
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Same here as well. Just watch for larger unexpected changes. If the sun is on one side of the coach as well I have noticed those tires being warmer then the aids that’s in the shade while driving.
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Old 11-19-2020, 05:06 AM   #6
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Brand: Thor Motor Coach
Model: Hurricane 31S
State: Texas
Posts: 2,261
THOR #6411
Quote:
Originally Posted by GordSanClemente View Post
Hi All,
I just added an RVI brake and TPMS system.

My the yellow sticker has my recommended tire pressure at 82 for all tires, front and back.
I was stunned at the pressure rise while driving on the freeway. BTW - It was about 80-85 degrees outside.

Rather than hijacking another thread, I was hoping to get some feedback on what is a normal rise in pressure.
Thanks All!
Weight and speed have the greatest effect on tire pressure gain. It all has to do with tire flexing (remember it is flat on the bottom) Weight is the main reason the front tires gain less pressure than the rear (less flexing). The inside rear will usually gain the most pressure because of less cooling air around the tire.
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