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Old 05-22-2011, 08:11 PM   #1
MAMalody
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PSI question

Hmm. I have 80# rims and they have worked great with the tires I have normally used which are E load range with max inflation at 80#. Last long trip I lost a tire and replace the tires on an axle with G load range rated at 110#, however, I only inflated to 80#. Setting other issues aside is there any safety issue here? I don't see one, however, I don't fully understand some of these issues.
 
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Old 05-22-2011, 10:02 PM   #2
Mudchief
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Mike, I don't see a problem with you running them at 80 pounds. I am running the G614's that are inflated only to 80 pounds. As long as you don't exceed the pressure of your rims or the minimum pressure for the load the tire is carrying you should be just fine.
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Old 05-23-2011, 02:44 AM   #3
LonnieB
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As Mudchief said. If you are unsure of the loaded weight of your trailer, you should weigh it on a certified scale.
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Old 05-23-2011, 02:47 AM   #4
stiles watson
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I think Dennis is right, but I would check them from time to time to see if you are getting wear on the outer edges from under inflation. Over inflation will make them wear in the middle.
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Old 05-23-2011, 03:23 AM   #5
bncinwv
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I would recommend checking a load inflation table to verify that the 80 psi provides the same weight bearing capacity that the original tires provided. I would think they would but if it were me, I would verify the load rating at 80 psi. Just my opinion.
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Old 05-24-2011, 12:07 AM   #6
Phil P
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Hello

Our total weight for the trailer when we are loaded for travel is 15,180 lbs. The individual tire weight on the heaviest tire is 3,010 lbs. The Goodyear inflation chart for the G614 235X85R16 is 90 psi. cold for this weight.

I have noticed when I pull out of a travel park with rock or gravel roads after driving a mile or so on a paved road the center tread is clean and the most outer tread still has the white powder from the rock road. This indicates to me that the tires may be a little over inflated. I still use Goodyear’s recommended inflation.

Here is Goosyears inflation chart.
http://www.goodyear.com/rv/pdf/rv_inflation.pdf

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Old 05-25-2011, 03:29 AM   #7
Waynem
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Hi Phil,
That tire is rated at 3750 at 110 psi. I wish Goodyear would give charts like michelin, or maybe I missed something. Here is what I try to do.

If 3750 is the high end, and you HAVE weighed your trailer and found it to be considerably lighter, you can reduce the pressure but never under or over the limits. One thing to consider is that the pressure will increase 2% fore 10 degrees of temperature rise, and 2% for 10 degrees of temperature decrease. Also .48 percent for 1000 feet of altitude change. I'm stating this because if 80 pounds is the low end, and 110 the high, if you exceed this you can go outside the limits of the tire. If you pick the happy medium, you will still be within tire manufactures specifications.

The tire pressure should be equal across the axle. So if you are runing 90 pounds on one tire you should be running 90 pounds across the axle on the other tire.

Hey Tireman - where are you.
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Old 05-25-2011, 03:48 AM   #8
Ozz
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Good info Cowboy.
Tireman is probably earning a living, remember that 'work' thing? Ugh, work, doesn't even sound good...
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Old 05-25-2011, 07:06 AM   #9
Phil P
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Hello Waynem

The address I posted on my last post is the Goodyear weight to pressure chart that includes the 235X85R16 tire.

When the wheel manufacturer mounted my G614’s for me they inflated the tires to 110 Psi. I operated 20,000 miles at that pressure and 18 months latter the tire pressure is still at 110 Psi. This is very unusual.

The frame shop that is working on fixing the improperly mounted spring hangars recommended I use the chart and reduce my pressure to 90 Psi on all tires.

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