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Old 03-15-2015, 01:10 PM   #1
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Brand: Thor Motor Coach
Model: Four Winds 31L
State: Indiana
Posts: 28
THOR #1477
Tire Prsuures Increasing...

Very strange situation yesterday, thoughts welcome...

So, yesterday I took my Claas C into my local Ford Dealer to have my new DuallyValves installed on my rear tires. Finding a garage to actually do that work was really hard, but that's a whole different thread.

Anyway, MH is brand new for us and after the installation we took it out on a maiden road trip to put some miles on it and have the DW get some road time behind the wheel. When I picked it up from Ford we went home and loaded the doggies for a day on the road. While there I double-checked the pressure in all the tires and put on my TPMS a modules on all the tires. Pressure was dead on 80psi in each tire.

Took off and about 30 miles down the highway my TPMS alert went off showing over-pressure on the right rear outer tire. I pulled over to check the tire and sure enough the pressure reading on the TPMS monitor was right...88psi.

While pulled over, I checked all the tires again and all 4 rear axle tires were at 88psi. What the ? Tires temps were all showing about 70 degrees, so no overheating here.

How did all the tires increase nearly exactly 8 lbs in 30 miles? I've never heard of something like this in 30+yrs of driving. Has anyone ever seen this amount of change? I dropped the pressure back down to 80psi and we put another 300 miles on it with no problems or change in the pressures.

What would cause this? Any help?
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Old 03-15-2015, 02:20 PM   #2
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Brand: Thor Motor Coach
Model: Four Winds 31L
State: Indiana
Posts: 28
THOR #1477
Never mind! Figured it out on a similar post I put on Forest River Forum. I'd set my TPMS to alert at a 10% increase, where it should be 20%. The 10% rise in "hot" tires was normal after all.
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Old 03-16-2015, 02:46 PM   #3
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Brand: Thor Motor Coach
Model: Axis 25.1
State: Pennsylvania
Posts: 299
THOR #1503
On a hot day you will see a significant increase in tire pressure as well as tire temperature. There will also be a difference between the tires on the sunny side compared to the tires running on the the shady side.

Before I switched to nitrogen, I would get a slow leak alarm when I stopped for a break. The tires would cool so fast that the TPMS would be triggered.

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