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Open Roads Forum  >  Fifth-Wheels

 > tire pressure

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Rich&Mar

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Posted: 09/11/20 07:35pm Link  |  Quote  |  Print  |  Notify Moderator

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?


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Old-Biscuit

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Posted: 09/11/20 08:22pm Link  |  Quote  |  Print  |  Notify Moderator

MAX PSI/Max Load Ratings is based on COLD Inflation...not driven on for 2 hours
Increase in PSI is already incorporated in Max PSI/Max Load Ratings

Check/Adjust tire pressures in AM prior to travel.
Leave it alone during travels --- check/adjust again next travel day

What is the weight on your trailer axles?
Where do you get that 8200# 5vr number?
What are 5vr axle ratings...5200#, 6000# etc?
What is the max load rating on those tires?

80# (Max PSI) would be needed IF---IF weight on tires was at/near Max Load Rating


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fj12ryder

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Posted: 09/11/20 09:32pm Link  |  Quote  |  Print  |  Notify Moderator

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


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CapriRacer

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Posted: 09/12/20 06:07am Link  |  Quote  |  Print  |  Notify Moderator

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!


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Posted: 09/12/20 06:11am Link  |  Quote  |  Print  |  Notify Moderator

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





MFL

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Posted: 09/12/20 07:26am Link  |  Quote  |  Print  |  Notify Moderator

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

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Posted: 09/12/20 07:48am Link  |  Quote  |  Print  |  Notify Moderator

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


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Lwiddis

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Posted: 09/12/20 08:53am Link  |  Quote  |  Print  |  Notify Moderator

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


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Allworth

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Posted: 09/12/20 11:35am Link  |  Quote  |  Print  |  Notify Moderator

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


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Posted: 09/12/20 12:05pm Link  |  Quote  |  Print  |  Notify Moderator

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.


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