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Old 03-09-2020, 10:19 AM   #1
Minitrbo
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Tire pressure while driving

Weeks ago I had a tire blowout. I replaced all the OEM F rated tires with G rated Carlisle. Subsequently I installed a TPMS. The cold pressure in each tire is 110 psi as recommended for the load. When driving in 65 F weather at 65 mph I saw the pressure get as high as 135 psi.

A lot of forums say things like "I believe ..." and so on. I'm interested in finding out if anyone knows for a fact, such as a data sheet from a manufacturer, at what pressure I should become concerned. FWIW the maximum temperature reported by the TPMS is 90 F.
 
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Old 03-09-2020, 11:12 AM   #2
rohrmann
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The tires are designed to handle the pressure rise when driving. Just make sure you check pressure when the tires are cold, like in the morning prior to driving.
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Old 03-09-2020, 12:29 PM   #3
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You do NOT haft to worry about a pressure rise. The tires are designed to handle that. Inflate then to 100 to 110 and don’t worry.
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Old 03-09-2020, 01:32 PM   #4
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As everyone has stated, they are rated for the increase in temp. That being said, if you have one that is increasing greatly, check out why. Possibly axle allignment, bearing heat, or maybe just under your heaviest slide causing it.
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Old 03-09-2020, 02:36 PM   #5
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I would be concerned about 135. I had a couple of G 614's get that high once and one of them failed. I think it was a combination of a large change in both temperature and altitude at the same time. The tires were also 6 years old and I wouldn't let that happen again either.
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Old 03-09-2020, 05:33 PM   #6
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Just wait for a 100 degree day then check LOL
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Old 03-10-2020, 08:02 AM   #7
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Yes, I would be concerned about 135 degrees on a 65 degree day. What was your speed? It is basic thermodynamics. Put 65 degree water in a pot and put it on the stove but do not turn on the stove. What will be the temperature in 1 hour?? It will be 65 Degrees. Now, turn the stove on to 100 degrees. What will be the water temperature in an hour?? 100 degrees MAXIMUM! It cannot boil! So how does the tire get to 135 degrees?? I would say that it is tire flexing causing the air temperature in the tire to increase. I think the 135 is a big issue. As an engineer--I did study thermodynamics! Either the temperature reading is in error-a possibility or the tires are defective.
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Old 03-10-2020, 11:16 AM   #8
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As an engineer who has studied thermodynamics and chemistry, which perhaps is not all that important methinks, since like playing telephone in grade school we lost track of the thread. The original topic was concern about tire PRESSURE measured in pounds per square inch, not tire TEMPERATURE. The peak TEMPERATURE I observed was 90 F. It was the pressure reported of 135 PSI for which I was concerned. Speed: 65 mph maximum.
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Old 03-10-2020, 12:06 PM   #9
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As an engineer you should know pressure and temperature go hand in hand.
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Old 03-10-2020, 03:23 PM   #10
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While traveling through AZ in 2018 my G614's all got to 135-138 with no ill effects. It was hot outside. I did notice that if I slowed from 65 to 60 that the temperature dropped 3-5 degrees. As other posters have said, I would be more concerned about one tire being significantly higher than the others on the TPMS.
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Old 03-10-2020, 03:29 PM   #11
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Question: Did you see this same increase in all four tires?? If only on one tire, I would be very worried.
To be honest I haven't heard good things about Carlisle Trailer tires, most are using either Goodyear or Sailun. But knowing nothing about Carlisle tires, the 25 pound increase might be normal.
I have run Goodyear 17.5 H's and now Sailun 17.5 H's and on a warm day will generally see a 25 pound increase from the set pressure of 125.
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Old 03-11-2020, 04:21 PM   #12
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You don't think the engineers at Goodyear tested these tires to Way more heat and air pressures that are marked on the tires. Ever wonder why they say to check tire pressures when the tire is cold. I bet these tires could stand 200PSI before they fail. If you drive in the desert on a 130 degree day you ever wonder what the PSI's in the tire would get to.I bet these tires have been subject to higher temperatures than that. After all peoples lives are at stake
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Old 03-15-2020, 01:24 PM   #13
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I have been thinking about getting my 5th wheel tires filled with nitrogen. Nitrogen is not effected by temperature. One place wanted $15.00 per tire and that seemed reasonable.
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Old 03-15-2020, 01:32 PM   #14
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I have been thinking about getting my 5th wheel tires filled with nitrogen. Nitrogen is not effected by temperature. One place wanted $15.00 per tire and that seemed reasonable.
I think that's a huge racket. I had nitrogen in the tires on a truck I bought once, the tire pressure still went up and down.

Then you have to find nitrogen to add if you need it, not so easy to find sometimes.
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Old 03-15-2020, 01:34 PM   #15
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Tire mfgrs state to set cold (not driven on) pressure. You don't have to worry about 135 degrees on all four tires. What you do have to be concerned with is if one tire is significantly higher than the other three, indicating a possible problem with that tire. Another possible tell-tale is if one axle's tires are hotter than the other, indicating that axle is carrying more weight for some reason.
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Old 03-15-2020, 01:37 PM   #16
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Had it in our car, no issues stayed the same summer and winter. I think it really depends on the people putting it in and if they evacuated the air correctly.
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Old 03-15-2020, 01:40 PM   #17
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I find that using a 78% Nitrogen mixture works very well.
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Old 03-15-2020, 02:04 PM   #18
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Quote:
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I find that using a 78% Nitrogen mixture works very well.
Yes indeed it does. LOL
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Old 03-15-2020, 03:00 PM   #19
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I find that using a 78% Nitrogen mixture works very well.
You sneaky guy!!
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Old 03-15-2020, 03:23 PM   #20
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You sneaky guy!!
Air is the Earth's atmosphere. Air around us is a mixture of many gases and dust particles. ... Air is a mixture of about 78% of nitrogen, 21% of oxygen, 0.9% of argon, 0.04% of carbon dioxide, and very small amounts of other gases. There is an average of about 1% water vapour.

How much do you pay for that?
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