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Old 01-13-2016, 07:01 AM   #11
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Join Date: May 2014
Location: WNY
Posts: 354
Originally Posted by jadatis View Post
Here the link to PDF of Goodyear.
End of first page and whole second page is about that psi+10 and even for truck tires 20 psi extra allowed.

Thanks for posting the link and the information. Interesting read.

2015 Jayco Eagle Premier 361REQS
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Old 01-13-2016, 07:09 AM   #12
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Join Date: Mar 2015
Location: Berkel-Enschot
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Krsmitty , I would use 80 , because your news are also ST, and so calculated in maximum load for 65m/h.
new tires will give lesser heatproduction at the 80 psi, and even if rimms are maxcold 65 psi it can get at boilingpoint of water about 40% higher so 91 psi, wich then is the maximum actual pressure ( so even warm) they can stand.
If you use your brakes carefully in mountains when descending , your inside tire temp probably wont reach 70 degr C/160 degr F .

Did some calculation with my made spreadsheet, about the tire inside pressure .
65 psi at 65degrF becomes 87.3 psi at 212 degr F, wich is probly the pressure the rimms can stand if given cold 65 psi on it.
80 psi at 65 degr F becomes 97.1 psi at 160 degr F so a bit higher then rimm absolute maximum. yudge for yourselfes Calculated also back the 87.3 assumed absolute max of a 65 psi given rimm max, at 160 degr F to be 71.6 psi at 65 degr F.

But mayby you can determine the max pressure of rimms by the maximum load of rimms wich you could find. If max load ( assuming you put new tires on same rimms) is the maxload of new tires , this can only be at same sises tires when maxpress is that 80 psi . So try to recollect that maxload of your rimms.

use your own yudgement to determine if this would be save.
But if you give the needed data , I will calculate a pressure advice.

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Old 01-13-2016, 08:30 AM   #13
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Join Date: Dec 2015
Location: Houston
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You also have to be aware that changing tire pressures also affects tire wear. Over inflate and they will wear prematurely down the middle.

One should really take it to the scales, especially with dual axles, to determine what is the best tire pressure settings fully loaded.

There is a table\link floating around here on this site that goes through the best way to determine proper tire pressures after conducting these tests on a scale.

P.S. I think BigJohnD posted it.

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