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Thread: Tire PSI?
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06-09-2022, 05:17 PM #11
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I have always thought it best to try to match load and pressure, and then expect 25% increase and 10% decrease as "acceptable" while you travel.
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06-09-2022, 05:32 PM #12
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FWIW, on this trip (3700 miles so far and temps ranging from low 40s to mid 90s), I've reset the tire pressure three times to the 125PSI on the placard early AM. This is also based on Cooper's recommendations for setting the max/min pressure and max temp for the TPMS (quote below for the Cooper H tires). The temperature of the tires has maxed out at 110F - that while stopped in fuel line. The max PSI for any of the tires so far has been 148 and each day the individual tire that is highest is a different one which makes me believe road condition/surface has as much to do with the temp increase. So I've been close to the +20% PSI Cooper recommends setting my TPMS thresholds to and that was highway in the mid-to-upper 80s temp.
"The RV trailer should have a placard on it that states what the tires should be inflated to. The max / min pressure should be +/- 20% of that number. Cooper would recommend a max temperature of 180F. The inflation pressure should be set at the placard specified pressure. If there are large changes in ambient temperature, the inflation pressure should be reset to the target inflation pressure at the current morning ambient temperature.
This came from our Radial Medium Truck department for you."Robin & John
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06-10-2022, 06:22 AM #13
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Bob (retired) & Vicki
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06-10-2022, 06:41 AM #14
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I thought it was very high also - but that came directly from Cooper. I have it set to 110 but I can see it going higher if I were in 100F weather.
Interesting - temps in the mid 80s early AM yesterday in NC and all the tires were 126F. Dropped the pressure 1 lb to 125. This morning in Shenandoah Valley, temps are mid 50s and my alarms of low pressure are going off for all four tires (121PSI and I've set a thresh hold drop of 122). 5PSI difference for a 30 degree drop in overnight temp.Last edited by ajg617; 06-10-2022 at 06:45 AM.
Robin & John
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06-10-2022, 07:48 AM #15
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I agree 100%. Over inflating your tires means a stiffer ride & that stresses frame, Bounces around everything in the trailer & wears out the crown in the tire thread. Under inflation is even worse as your tires can fail. If you don’t want to get each wheel position weighed then at least go to a truck scale & get each axle weighed. As an example if your axle weighs 6500 lbs you can safely assume that one side weighs no more than 25% more than the other. That would mean one wheel at 4000 & one at 2500. I have weighed each of my wheels & never saw a difference of more than 300 lbs though. If you want to be safe inflate the tires to the extreme of 4000 lbs according to the inflation load table for your tires. It’s true that there are lots of tire failures but there’s also lots of frame failures from running rough roads. Your tires are designed to flex. If they are over inflated they will not flex. That’s just my opinion after 17 years of averaging 10000 miles a year towing with only one tire failure & that was from a leaking tire in the few years I didn’t use tire monitoring systems.
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06-10-2022, 11:33 AM #16
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To be clear... I am not worried about PSI for tire longevity. I plan on changing these bad boys within a year or two regardless of wear.
My concern is that it's not even as hot as it's gonna get this summer and my tires already go nearly 20% over max psi. I don't want a blow out, seperation, or some other thing to happen because of too high of PSI.
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06-10-2022, 11:39 AM #17
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06-10-2022, 11:45 AM #18
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Yes, I fully understand that. It should have all been implied and assumed in the post based on previous posts in this same thread.
There is some absolute "max psi".... and that max psi has some relation to the cold max psi (% over cold max psi).... I have commonly read that the max psi where things may start going wrong with the tire is 20-25% over max cold psi. Currently I am flirting with that lowering bound.
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06-10-2022, 05:07 PM #19
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So what you're saying is that if your max pressure is 100 psi, at 125 you're over pressure? That is not at all true based on everything I have read, and I have read a lot on the subject. Here is a pretty good explanation of what you should do. Note, I did not and do not rely on this only. I have read more on the subject, this just, to me, seems to make sense and is what I follow. https://www.rvtiresafety.net/search/...ax%20Inflationhttps://www.rvtiresafety.net/search/...ax%20Inflation. There is also this, although not as detailed https://www.bigotires.com/resources/all-about-tires.
Bob (retired) & Vicki
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06-11-2022, 02:44 AM #202021 398M Full Body Paint 8k axles. LRH tires. Disc brakes.
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