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Old 03-22-2015, 02:28 PM   #1
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Tire Pressure Question

Made or first trip to Florida this past January and we're getting ready to head back in a few days. When we came down I set all the tires at 80 psi as stated on the tire. After a few hours the tires were at about 95 psi. When we stopped at night the tires would be back to around 85 psi in the morning then back up again after a few hours running. First, is this normal? Second, should I start at a lower PSI to compensate for the increase? Thanks

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Old 03-22-2015, 02:38 PM   #2
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Perfectly normal and NO, don't change the pressure. All tire pressures are set when the tire is cold.

The pressure on the sidewall of a Michelin RV tire and many others is not the "Maximum" the tire should ever have (unlike car tires) it is the minimum to support the maximum rated carrying capacity of the tire.

From page 2 of the 06/07 Michelin RV Tire Guide:
"If you look at the tire's sidewall, you'll see the maximum load capacity allowed for the size tire and load rating, and the minimum cold air inflation needed to carry the maximum load."
From page 6 of the GoodYear RV Tire and Care Guide:
"How much air is enough?
The proper air inflation for your tires depends on how much your fully loaded RV or trailer weighs. Look at the sidewall of your RV tire and you’ll see the maximum load capacity for the tire size and load rating, as well as the minimum cold air inflation, needed to carry that maximum load."
From TOYO:
Q: What are the consequences of inflating the tires to accommodate the actual loads?
A: If the inflation pressure corresponds to the actual tire load according to the tire manufacturer’s load and pressure table, the tire will be running at 100% of its rated load at that pressure. This practice may not provide sufficient safety margin. Any air pressure loss below the minimum required to carry the load can result in eventual tire failure.
But then they go ahead and publish a weight/pressure chart allowing lower pressure for RV's!!

From the August 2010 Motorhome Magazine "Tread Carefully" tire article:
The maximum load capacity allowed for the size tire and load rating and the minimum cold air inflation needed to carry that maximum load are located on the tire’s sidewall.
The only way to establish your tire pressure is to weigh the rig as it's loaded for a trip and four "corner" is best. In the OP's case 80 psi is possibly too high but he won't know till it's weighed.

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Old 03-22-2015, 02:43 PM   #3
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That is very normal. The heated tires air expands so you get a higher reading. Your tire pressures should always be set with a cold tire. If you have to add air along the way, make the pressure the same as the other tires.
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Old 03-23-2015, 05:13 AM   #4
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Thank you
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Old 03-23-2015, 05:32 AM   #5
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If the temps is in the 80's when you check them before leaving FL.
If you add 10 PSI then when you get to the cold North they will be about the right psi.

I do that every spring before leaving FL. Then on the first cold night going up north when the sensor monitor goes off. I need to go outside and reset all of the sensors.
And don't need to add any air.
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Old 03-23-2015, 10:35 AM   #6
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"The pressure your tires require is determined by the vehicle manufacturer in conjunction with the tire manufacturer and is based on the vehicle’s gross axle load. Every vehicle is required by federal regulations to include a tire information placard. This placard may also be referred to as the tire certification label or federal tire tag. Vehicle manufacturers are required by federal motor vehicle safety standards (FMVSS) to apply tires of a suitable size, load range and inflation pressure (as shown on the tire information placard) that are capable of supporting no less than the gross axle weight rating (GAWR). Consequently, the vehicle manufacturer’s specified tire inflation pressure is not arbitrary; it is established by federal safety regulations (ref: Code of Federal Regulations 49, 571.120, and Part 567)."

The event of increased tire inflation pressure is a product of thermal equilibrium and is fully accounted for by the tire manufacturers.


p.s. Sometimes tire manufacturers take it for granted that readers of the information posted about their tires are also familiar with tire industry standards. For original equipment tires the proper procedure is to NEVER use less tire inflation pressure than what is depicted on the vehicle's certification label, tire placard or in the vehicle owner's manual.
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Old 03-23-2015, 12:31 PM   #7
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That is perfectly normal. What everyone said above is true. Also remember that the "cold tire pressure" means the pressure of the tire after the tire has set for several hours. such as overnight after a long trip If you arrive at night or before beginning a trip check your tire pressure, that is cold tire pressure. Once you start rolling your pressure will increase.
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Old 03-23-2015, 12:35 PM   #8
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If your pressure goes from 80 to 95 its to much .
Cource can be overloading or inacurate reading of pressure device.
If cource is overloading , you can discuss about that being wrong, but fact is that you are and you have to keep a pressure that dont damage the tires.
pressure rises by normal driving and no other influences about 10 to 11%.
this would mean to 89 /90 psi
So if not sunshine or higher ambiënt temp or sever braking is happening, your pressure is a bit to low.
Can also be that its given to 5 accurate by the TMPS.
most tire-makers allow 10 psi higher then AT-pressure given on sidewall.

So if you try 90 for the tires that you measured ( can be different front and behind) , you will probably see that it rises by normal driving to about 99/100 and then the temp inside the tire is about 110/115 degr F, wich is pretty normal.
The temperature inside the tire is a measure for how hot the critical rings of tires rubber get .

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