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Old 08-23-2009, 08:02 PM   #1
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tire pressure

I had an incident in the Arizona desert recently that I am not sure what the answer is. While going across the California and Arizona desert this summer ( the ambient temp. was at least 110 deg. ) I had an explosive blowout halfway between Needles and Kingman.

The question is : what pressure should you run the tires on? The manufacture says 80 psi. but is that to high going across the desert? Also the old tires were made in China and I had at least four of the six tires with loose treads. Eventually replaced all six to make sure.

Anyone have suggestions.


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Old 08-23-2009, 08:12 PM   #2
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All the tire manufacturers publish load / pressure charts for their tires.

You need to wiegh your rig, loaded, preferably corners, but at least axles, figure the actual load per tire, and look it up on the tire manufacturers chart. then add five for good luck and air em up, cold.
All the tires on a single axle must be the same psi.

Tires blow from overheating, but they overheat from flexing too much, and they flex too much if they are underinflated or overloaded.
The temp in the desert wasn't really a big factor.

On our west coast trip this summer, I checked the pavement temp with an IR gun. Air temp was lower 90's, the blacktop was over 170 degrees!

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Old 08-23-2009, 08:25 PM   #3
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I had at least four of the six tires with loose treads
I have no idea what you mean by this...

But Jim is right-on. You do NOT reduce the cold tire pressure in hotter weather. As Jim indicates, underflated tires would run HOTTER in that situation rather than cooler. You should set the tire pressure when the tires are "cold" --- before setting out in the morning --- based on the weight they are carrying and the tire mfg pressure chart for that particular model tire. No idea what model RV you have, but from your comment that the tires were made in China I suspect it was a trailer. Many trailers have OEM tires that are inadequate for the weight they are carrying. And added to that, Chinese mfg'ered tires are notorious for failures. An overloaded Chinese tire is a recipie for disaster!!!
Paul (KE5LXU) ...was fulltimin', now parttimin'
'03 Winnebago UA 40e / '05 Honda Odyssey toad
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Old 08-23-2009, 08:44 PM   #4
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The reason for the question is the when I checked them the morning after I bought them, it appeared the the dealer only had about 70psi in them. I tested them when they were cold and then put them at 80 psi. I haven't had any problems since and unless someone can tell me that that is not the right thing to do I will keep them at 80.
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Old 08-23-2009, 08:50 PM   #5
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I run ST trailer tires at sidewall maximum, as recommended by ST trailer tire manufacturers. Carlisle Tire Inc. says this is so important they void the warranty if their tires are used at less than sidewall maximum. http://www.carlisletire.com/product_care/proper_tire_care_safety.pdf
I think the warning is at top of page two.
Note: this does not apply to Motor Home, truck, or automobile tires; only ST trailer tires.
2000 Winnebago Ultimate Freedom USQ40JD, ISC 8.3 Cummins 350, Spartan MM Chassis. USA 1SG, retired;PPA,Good Sam Life member."We the people are the rightful masters of both the Congress and the Courts - not to overthrow the Constitution but to overthrow men who pervert theConstitution. "Abraham Lincoln"
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Old 08-23-2009, 08:54 PM   #6
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This question about the tire pressure is for a 35' motorhome and the tires treads were coming loose. other than the major blowout it was a great trip.
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Old 08-24-2009, 08:23 AM   #7
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Well I am not an expert. However I lived in AZ and the desert for 25 years. I am a cattle rancher now in TN. You should do a number of things regarding tires on any unit be it car trailer ect.
First of all buy the best tire you can afford. with the least rolling resistance and the most ply.
# 1 Michlien
# 2 Yokahoma
# 3 Liberator
1&2 are for moter vec. and offer the least rolling resistance E rated and wear like iron. Added benefit improved fuel mileage.
# 3 great 10 ply trailer or 5th wheel trailer.

Next thing balance, rotate, align.
I haul heavy loads of feed and hay keep my tires at max pressure at all times. Ialso have everything that has tires on fill with Nitrogen.
I have peeled tires in the heat tread serperation is no fun China makes crap and their are no two ways about it.
When it comes to family peace of mind, safety, and well being of others on the road take a good look at your tires just like your feet they got to get you there.
Good place to shop for tires Tire Rack Hope this is helpful.
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Old 08-24-2009, 08:50 AM   #8
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For an interesting discussion on tire pressure see Discussions

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Old 08-24-2009, 11:42 AM   #9
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We generally run fully loaded on extended trips. Tires read 95psi cold, I inflate to 100 (allowing for tire gauge), which is 5 lbs over the minumum inflation for max. load.
Rather be 5 lbs over than 5 under.
08 Allegro Open Road

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Old 08-24-2009, 12:11 PM   #10
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When you say cold do you mean 55 degrees or 90 degrees? I have my MH inside a building. Early morning temperature at 55 degrees tire pressure is 95, afternoon temperature at 90 degrees tire pressure is 100 to 105.
Retired farmer who started with nothing and have most of it left.
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Old 08-25-2009, 11:39 AM   #11
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I am saying check before you hit the road. As much as 10 minuets on the road will begin to bring up pressure and cause a faulty read for your tire gauge as "cold".
Try checking several times during a trips and you will see the variations. My tires, in the Florida driving conditions can fluctuate as much as 15 lbs. i have checked my tires on more than one occasion and only found that amount of variance in the pressure, from cold to the end of trip.
08 Allegro Open Road

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Old 08-26-2009, 03:28 AM   #12
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Nitrogen in Tires

Will eliminate the need to constantly check the tire pressure. It keeps your pressure constant does not effect tire composition as does compressd air does. increases tire life,better fuel mileage and is used in all military jet aircraft tires. When installing you fill tire with Nitrogen let it out and fill again to recomended pressure. A properly pressurized Class A tire should see in excess of120k miles before replacing is required.

Additional benefit to Nitrogen if your unit sets for extended periods you do not lose pressure as you do with compressed air.
Average cost per tire for Nitrogen fill 3 to 5 dollars. Be safe out there.
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Old 08-26-2009, 04:26 AM   #13
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This thread is unbelievable to me. If you don't know what your mh weighs then you can't possibly know what the tire air pressure should be.

To the poster regarding presures increasing 5-10 lbs when ambeint temp goes from 55-90 is hard for me to believe. I check my pressures in the morning (80 degrees)and the pressure hardly increases that much driving 65 mph for hours in the Texas heat. Maybe I have a faulty guage.
Jim with Judy
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Toads: 08 Jeep Wrangler Sport; 11 Chevy Malibu
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Old 08-26-2009, 05:57 AM   #14
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There's a good chance that a TPMS (tire pressure monitoring system) would have notified you of a possible problem before the blowout. I like the system at Truck System Technologies, Inc

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