tire pressure

CapriRacer wrote:
Just so everyone knows: The burst pressure of a tire is many times the max pressure. Unless a tire is on fire, there is no risk of the tire bursting on its own without it being damaged by some object - even in Death Valley!

Disagree. I've seen tires burst while mounted as a spare and never been on the road. One was mounted on the rear of a trailer, under a vinyl cover, and it blew a hole in the cover. Saw another one burst that was mounted under the trailer as a spare. Cheap Chinese tires.

On topic, I never run max pressure in any tire. Tire pressure is a function of the weight being carried. If you're not at max weight there is no reason to be at max psi. My truck tires says 80 max psi. I'd be a fool to run my tires at that pressure. I run 70 front and 65 rear per the door sticker and the scaled weight that I carry. My trailer is at 70 psi.

Rich&Mar wrote:
do you run the max pressure in your tires as written on the sidewall? I have the Endurance, and it states 80# psi. Seems to me you need to take the outside temperature into consideration. I an reluctant to inflate to 80 psi and go on the road when it's 90% out. Then it becomes a guessing game, what psi at 90, at 75, at 45 degrees. 8200lb 5er. The sidewall does read, max pressure, so should you put less due to the temp? Or let the pressure go well over the 80 because of the heat?

Sometimes they write maximum cold pressure, and yes, as already written, pressure rising above yours 80 psi is included in the advice.
A few years ago I read from Capriracer or Tireman9,in a topic, that tires have teststandards, that they have to stand 2 to 3 times the referencepressure( what you think is the max pressure). For 80 psi this would mean ( sit down first) somewhere between 160 and 240 psi.

If you fill with 1.4 times reference ( 1.4 x 80= 112 psi) at freesing point 32 degr F. And incidentially temp in tire rises to boiling point212 degrF, the pressure will rise to a small 2x reference ( 2x 80 psi= 160 psi) , so still within the testing standards.

So dont worry about a the relatively small pressure rising you mention.

But not always maximum 80 psi is needed, for instance tandem-axle trailers can often do with much lower.

Let me calculate a safe pressure for you, with max reserve, but still no bumping.

I have notice on my car a max of 2 psi difference if it was 70 or 90 degrees out as long as they are not getting direct heat from the sun on the tires. I run mine always at 80 and never had a problem except for my last set of Michelins that the sidewall started failing at just over 6 years. No more Michelins for me I am now replacing with Endurance soon.

Overthinking tire pressure is one of the most common sports among RVers.

I want my Load Range D TT tires running at their max weight capacity...65 psi.

If your 5er is properly tired, I’d recommend airing up to sidewall psi (cold) as stated above and then using some type of TPMS to ensure it doesn’t start dropping precipitously. If you’re properly tired, you don’t have to worry if you get up on a cold day and it’s 5psi lower, you just drive. But again, recommend you inflate to sidewall psi and use TPMS

CapriRacer wrote:
Just so everyone knows: The burst pressure of a tire is many times the max pressure. Unless a tire is on fire, there is no risk of the tire bursting on its own without it being damaged by some object - even in Death Valley!

Interesting...I know it would vary, all ST tires not being equal, in quality and design, but what would you consider a possible psi bursting point of the OPs GY Endurance E-rated tire, if air is continuously added? I know you can not give an exact psi, but maybe a range of psi guess?

Jerry

I agree with Old-Biscuit. Tires need to be adjusted to proper psi when cold. Yes, they will heat up rolling down the road, especially in the heat of the day. Keeping an ST tire at max pressure, as read on the sidewall will keep them cooler, get best mpg, due to less rolling resistance. For this reason, I never suggest to way over tire your trailer. An example...If you put G-rated tires on that FW, I would not suggest to air them to 110 psi, nor would I say just run them at 70 psi, per the inflation chart. That would simply not be the right tire for the weight of the trailer.

If your FW weight mentioned 8,200, is dry wt it will likely weigh 10K when loaded to travel, and even though the truck will carry about 2K of the weight, I'd still use 80 psi cold pressure.

Jerry

Just so everyone knows: The burst pressure of a tire is many times the max pressure. Unless a tire is on fire, there is no risk of the tire bursting on its own without it being damaged by some object - even in Death Valley!

^^^^^^^^^^^What he said.