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Old 06-21-2019, 09:06 PM   #1
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Heated tire pressure reaching rim max pressure rating

I have a 2016 Ventana, 40LE 360 HP.
I have a TPS monitoring system installed on all 6 - 22.5" tires.
Based on my axle loads I typically run 110 psi front and 90 psi rears.
Now for my question.
As I travel, the tires heat up and I see the TPS pressures typically increase 15 to 22 psi worries me.
The front tires reaching 128 psi is just 2 psi from the Newmar replaced 120 psi rated rims with the required "recalled" rims, that have a pressure rating of 130 psi.
The same pressure increases occur with the rear tires, which Newmar wouldn't change the recalled 120 psi rated rims stating since the rears are duels, I wouldn't need a higher tire pressure that would exceed the 120 psi rated rims even though the tires are rated for 130 psi. BUT THEY DO!
How do you maintain the pressures below the rim rated pressures?

I doubt that you can ignore the pressure increases, so what is one to do?
Anyone having experience and have an answer, would be greatly appreciated.
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Old 06-21-2019, 09:42 PM   #2
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My understanding from reading the Alcoa manual, maximum pressure is the inflation pressure measured at ambient temperature, not hot, running temperatures. In short, if the rim states a max pressure of 120 psi, the tire’s “cold” pressure should not exceed 120 psi. The increase in pressure when the tire is run is engineered into the rim, just like the tire itself.

https://www.arconic.com/alcoawheels/...al-english.pdf
Page 42 in the above link.
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Old 06-21-2019, 09:49 PM   #3
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Ignore them. Cold pressure is all you care about. Don’t bleed based on warmed-up pressure. You’d be reducing your load capacity, trading pressure for temperature and potential catastrophic failure.
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Old 06-21-2019, 11:28 PM   #4
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You do not want to decrease your tire pressure your asking for a blow out and more heat build up.
The tire information will give you more info and you can ask the tire engineer, TIREMAN9, on thread the same question by sending a PM if he does not already come in to answer your question here.
Here is the link to tire information.
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Old 06-22-2019, 12:28 PM   #5
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This owner seems to be having similar problems with heat but internal sensors.
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Old 06-24-2019, 08:06 AM   #6
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Quote:
Originally Posted by 007";4830562]You do not want to decrease your tire pressure your asking for a blow out and more heat build up.
The tire information will give you more info and you can ask the tire engineer, TIREMAN9, on thread the same question by sending a PM if he does not already come in to answer your question here.
Here is [B][URL="http://www.irv2.com/forums/f103/important-information-for-newmar-owners-375453.html
the link[/URL][/B] to tire information.

Thanks 007



Yes "COLD" (Ambient temperature) is the only pressure people should worry about. All tire engineers and wheel mfg know tire pressure increases as the tire temperature increases and we account for that in our design evaluation process.


As I cover in a short series of posts on my blog on the relationship between temperature and pressure the pressure will increase by about 2% for each increase in temperature of 10F.
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Old 06-25-2019, 04:41 PM   #7
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Heated tire pressure reaching rim max pressure rating.

Ok, thank you all for your replies.
Especially since all the replies offered the same response and without one difference of opinion offered.
You all just lowered my anxiety quotient level considerably.
Thank you much.
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