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Old 01-19-2015, 11:38 AM   #41
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Quote:
Originally Posted by Timex View Post
So what is that?

I'm running 70 psi and I think the max is 80.
What Carlisle is saying is their ST tires are designed to use full sidewall pressures. I'm sorry, I thought "full sidewall pressures" was self explanatory. Load Range E tires have a full sidewall pressure of 80 psi not 70.

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Old 01-19-2015, 01:03 PM   #42
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Yes, Load Range D is 65psi and LR-E is 80psi.
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Old 01-19-2015, 01:07 PM   #43
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What that means Timex is that you are running underinflated, one of the top reasons for tire failure. Better bump the psi up to 80.
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Old 01-19-2015, 03:41 PM   #44
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I'll check into that.
Thanks for the warning.
Sometimes I need self explaining to make it better explanatory.
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Old 01-19-2015, 04:04 PM   #45
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I'm not wanting to start a debate here but I always thought that max PSI was for max loads.

Per the above link:
– Do not overload trailer tires, maximum loads are listed on the
sidewall of the tire.
– Maintain air pressure at the maximum PSI recommended on the
tire sidewall.

So, no matter if I'm at the max load or not, the tires need to be at max psi?

If I'm at say 85% of a max load the tires still need to be at 80 psi?
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Old 01-19-2015, 04:07 PM   #46
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Timex,
That is precisely the way I interpret it.


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Old 01-19-2015, 05:54 PM   #47
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Max Tire Pressure.

Don't let the "Max tire pressure" scare you. After driving for a while, its going up as much as 15% along with the temp. This is NORMAL! If you check the pres AFTER driving, you have no way to judge what was your "COLD" inflation pressure was. You have to wait at least 3 hrs for the temps and pressures to go back to "cold".
I see 90-91 psi while driving on hwys in the southern states where they are much warmer than up north. You won't know this unless you have a TPMS, which are worth their weight in gold. RV dealers should include them with every unit. They can save you BIG PROBLEMS! Most tire failures occure at or above 175* per the TPMS people.
I ride on LRE tires which state 80psi cold and that is where I run them.
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Old 01-19-2015, 08:16 PM   #48
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I have the Tire Minder system and the psi's go up to the high 70's unless the roads are hot and then they may reach into the 80's.
I wonder what they'd go up to if I cold inflated them at 80 psi to start with.
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Old 01-20-2015, 10:22 AM   #49
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This is from the Goodyear website:

"Unless trying to resolve poor ride quality problems with an RV trailer, it is recommended that trailer tires be inflated to the pressure indicated on the sidewall of the tire. Trailer tires experience significant lateral (side-to-side) loads due to vehicle sway from uneven roads or passing vehicles. Using the inflation pressure engraved on the sidewall will provide optimum load carrying capacity and minimize heat build-up."
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Old 01-24-2015, 08:31 AM   #50
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Never use inflation pressures lower than those printed on the vehicle placard.

Here is a reference that supports the statement above.

http://www.trucktires.com/bridgeston.../WeighForm.pdf

That statement is often overlooked by trailer owners when they are interested in manipulating their trailer’s tire pressures.

Other information usually overlooked is tire pressure recommendations from the individual tire manufacturer. Most ST tire manufacturers only recommend using the tire's air pressure rating found on its sidewall. Vehicle manufacturers set recommended tire pressures and always recommend full sidewall pressures for ST tires. Even the heavier tires used on 7000# & 8000# axles which are normally LT or medium duty truck tires are set at air pressures that achieve maximum load capacity from those tires.

So what does that mean when going up a load ranges with the same size and design tire as the OE tire? It means not to use less tire pressure than recommended on the tire placard/certification label for the OE tires. However the higher load range tires will allow increased tire pressures up to the tire maximum. Any such increase will provide (often needed) more load capacity reserves.

That's how things are supposed to work. Individual owners deviating from tire industry and vehicle manufacturer standards can always do so at their own risk.

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