Correct Tire Pressure

[gvansickle1]

Quick question for you experienced folk; the stated Max pressure for my TT tires is 65 lbs. but dealer filled them to 55 lbs. and when questioned stated that this was the correct "cold" tire pressure. I tend to believe him as I understand that they (tires) will heat up under use but as I'm a bit anal I had to ask; leave them at 55 lbs. Or set fill'em up to 65?

[JRTJH]

My tires say, "Max COLD inflation pressure 65 PSI" At 55PSI they are underinflated. Your dealer needs to reread the tire manual.

[theeyres]

Inflate them to 65. Read the little label on the side of trailer and it will tell you where you should be. Trust that label...not the dealer. He's off base.

[gvansickle1]

Appreciate it gents! I'd really hate to have a blow-out or worse this early on!

[Bob Landry]

Run max cold pressure for the best wear. I have read several threads on this where the engineers have turned it into a rocket project by breaking it down to tire pressure vs trailer weight on each axle, blah, blah, but that's what engineers do. Max inflation means less surface contact, less heat, and thus less wear.

[jadatis]

But if you take to high pressure things go bumping.
Made spreadsheet for it but if you have ST tires , the maximum load has to be lowered by 15% first to give it the same deflection of a LT tire wich make them last longer. Then the needed pressure is mostly that pressure needed for the maximum load, yours 65 psi, wich is not the maximum pressure of the tire.

So if you can give me here maximum load and needed pressure for that of tires.
And GAWR ( gross axle weight ratings) of Travel trailer and number of wheels and axles, I can calculate the pressure for you. Will give a picture of filled in spreadsheet in my answer.

Best would be seperatate weighed wheel( pair) loads in the loading you drive.
But this is probably not done yet.

[CWtheMan]

Just what is a correct tire pressure for RV trailer tires? Under every day normal circumstances there is a single answer with three possible locations to look for the recommended tire pressure. The trailer's federal certification label, a tire placard or in the trailer's owner's manual.

Correct tire pressures are synonymous with recommended tire pressures.

Tire manufacturers build tires and produce load inflation charts for each different size. That is the end of their responsibility.

Vehicle manufacturers select tire sizes and set recommended tire pressures that become the standard for the vehicle they are fitted to. In fact, they are directed to do so by the regulatory authority (DOT).

So, bottom line, use the information provide with your vehicle for its tire pressures. Second guessing the vehicle manufacturers recommended tire pressures will surely shorten the tires life expectancy.

CW

p.s. Tires found to be 20% below the vehicle manufactures recommended tire pressure is considered to be in a "run flat" condition and needs to be removed and inspected by someone experienced in such inspections.

[{tpc}]

How about this one...my trailer says tires should be a specific size, and they are. They also say they they should be at 50 psi cold. When I look on the tire it says max psi of 50.

So do u run them at 50 cold? Just a little under like 48 or 45? You would think the tires are wrong but the sticker says that exact size and that's how it came out if the factory. So what gives?

[Bob Landry]

Originally Posted by jadatis

But if you take to high pressure things go bumping.
Made spreadsheet for it but if you have ST tires , the maximum load has to be lowered by 15% first to give it the same deflection of a LT tire wich make them last longer. Then the needed pressure is mostly that pressure needed for the maximum load, yours 65 psi, wich is not the maximum pressure of the tire.

So if you can give me here maximum load and needed pressure for that of tires.
And GAWR ( gross axle weight ratings) of Travel trailer and number of wheels and axles, I can calculate the pressure for you. Will give a picture of filled in spreadsheet in my answer.

Best would be seperatate weighed wheel( pair) loads in the loading you drive.
But this is probably not done yet.

Now THIS is a good example of having too much time on your hands.
I run all of mine at the max pressure indicated on the tire and get 70K miles out of Michelins on my truck. The Load Range E Maxxis on the trailer gets 80lbs. That's good enough for me.