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Old 04-19-2019, 05:54 PM   #1
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Tire pressure

New front tires...sidewall says 120 psi. docs in the coach say 82 psi. The mechanic at the tire company insisted 120 was correct, but I've always thought the Thor numbers should be followed. I'm thinking around 90.
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Old 04-19-2019, 08:20 PM   #2
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Weight is the only way to be sure of psig, scale, tire chart and decrease if the chart says so

The sticker weight is a guesstimate
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Old 04-19-2019, 08:35 PM   #3
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The pressure on the sidewall is the maximum allowable for the tire at it's maximum load. There are tire charts that convert the weight to the proper tire pressure. Goodyear and Michelin have charts on their websites, but you need to have your coach weighed to get the proper air pressure.
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Old 04-19-2019, 09:08 PM   #4
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You donít have your coach listed or the size and make of your tires. If you list them, someone will probably send you or direct you to the website that has the chart for those tires. Correct tire pressure is crucial to the handling and safety of your coach and to the wear of your tires. The only way you can know your correct tire pressure for sure is to load your coach like you intend to travel in it and go weigh your coach both front and rear. Some weigh all four corners separately, but unless you have some reason to think that one side is way different than the other - that is probably not necessary. With the front and rear weight measurements, you can then go to the tire charts and see what the tire manufacturer recommends. I think that a set of Tire Minders or similar equipment to constantly measure your tire pressures and temperatures is a necessary safety feature - if your coach is not already so equipped. All my cars have this as standard equipment and a blow out is so much more dangerous in an RV than a car. I donít know the RV manufactures get away with not providing it as standard on all RVs.
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Old 04-19-2019, 09:50 PM   #5
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Quote:
Originally Posted by Mitch S View Post
The pressure on the sidewall is the maximum allowable for the tire at it's maximum load. .
I agree...
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Old 04-19-2019, 11:45 PM   #6
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Originally Posted by Mitch S View Post
The pressure on the sidewall is the maximum allowable for the tire at it's maximum load. There are tire charts that convert the weight to the proper tire pressure. Goodyear and Michelin have charts on their websites, but you need to have your coach weighed to get the proper air pressure.
The sidewall psig stamp is the minimum pressure for the maximum load stated

Cold psig as it will go up when operating in hot weather
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Old 04-20-2019, 01:11 AM   #7
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Originally Posted by lwmcguire View Post
The sidewall psig stamp is the minimum pressure for the maximum load stated

Cold psig as it will go up when operating in hot weather
No. The Psi tire pressure embossed on the side of the tire is the maximum cold psi that the tire is designed to hold, whether it is under any load or not. That tire and that pressure determines what safe load the tire can carry. Most tires are not (and donít need to be) filled to max pressure. The psi in the tire will increase as the ambient air temperature increases or as you run your tires and heat them up. The front tires in my RV should be run at 80 psi or max pressure for my Michelin tires to carry the 4000lbs of weight load on the two front tires. When I travel south in the late fall, I fill those tires to 80 psi at about 50 degrees F. As I travel south and the ambient air temp increases to 60 and 70, I have to let air out of the tires in the morning to keep them below 80 psi because the psi increases with the ambient temp. When I run my tires at 70 mph on a hot road, my Tire Minders will tell me that the temp in my tires has increased from the ambient temperature to 90-100 degrees and the psi will rise 5 lbs or more. That is what the tire is designed for.
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Old 04-20-2019, 01:29 AM   #8
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Use the pressures on the yellow sticker until you get your coach weighed and then adjust as necessary.

And steer clear of that "mechanic".
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Old 04-20-2019, 01:59 AM   #9
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First: welcome to the forum.

Second: Met a Seaweed in Oak Island a couple years ago during a PGR Vietnam Wall escort with the Grand Dude. You the same person?

Third: Recommend you go to the first link on this forum and download Ed's great handbook. If you don't have a Axis/Vegas you can still use a lot of it for your particular RV.

Fourth: 75 front/65 rear are basic values for Axis/Vegas RV.
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Old 04-22-2019, 02:27 AM   #10
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Thanks to all for the info...I'll get front and rear weights shortly and check the charts. It's a 2014 ACE 29.2, and 82 psi is the number for now.
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