Good Sam Club Open Roads Forum: PSI when using higher load range tires.


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2112

Texas

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Posted: 08/30/22 06:46pm

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I did the exact same thing and have been running them at 68psi for almost 5 years now.

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Lwiddis

Southern California :(

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Posted: 08/30/22 06:47pm

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Excellent caution, Ford.

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MFL

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Posted: 08/30/22 07:13pm

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ford truck guy wrote:

Make sure of your wheel’s pressure rating before pumping to 80 psi

If you remember my wheel rating thread earlier this year, I solved the problem by ordering new E-rated tires, already assembled on high quality Vesper wheels, with high rated stems too.

Cost more, but nice to have delivered to my door, and easy to switch myself, right at home.

I donated the other tires/wheels to a relative that was happy to come pick them up.

Jerry

ktmrfs

Portland, Oregon

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Posted: 08/30/22 07:18pm

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I also went from D to E rated tires on two trailers. My process
a) checked the max load and psi rating on the rims 80psi
b) made sure metal valve stems were installed instead of rubber
c) trailers had D rated tires and psi spec on the trailer placard was 65psi
d) I inflate to 75psi

Now with car/truck tires tire mfg or vehicle mfg state tire pressure requirements. On ST trailer tires many of the mfg recomend running at or near the max psi on trailers unless you have gone up several load ratings.

Done the 75psi now for several sets of tires, no unusual tire wear. Radial tires are pretty insensitive to tire pressure on tread wear issue unlike bias ply tires where under/over inflation affected center vs. side wear patterns.

As for the X psi above actual load, do a calculation on your TV recomended psi vs actual tire load. In many cases you'll find the recomended tire pressure is WELL above actual load on the axles even at max load.

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JIMNLIN

Oklahoma

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Posted: 08/30/22 08:22pm

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TheOMB wrote:

My trailer had 4, D load range tires. From advice of many friends I've up graded to E load range. Just got a set of Good Year Endurance with max PSI of 80. Previous tires and trailer sticker says PSI 65.

Should I run 65, 80 or other PSI?

Visually the Load Range E look better at 80 PSI without a slight bulge.

In goodyearrvtires.com website has several clickies for tire tech for rv of all types.
In their weighing rv website https://www.goodyearrvtires.com/weighing-your-rv.aspx Goodyear says quote'...

**Special Considerations
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.**

Impossible giving out a flat answer to your specific trailer tire needs as we have no idea of your trailers OEM tire size or the trailers OEM axle/wheel ratings.

"good judgment comes from experience, and a lot of that comes from bad judgment" ............ Will Rogers

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ktmrfs

Portland, Oregon

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Posted: 08/30/22 10:02pm

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JIMNLIN wrote:

TheOMB wrote:

at least several years ago when I ran Maxxis tires they had virtually the same info on RV ST tire inflation recomendations.

ROBERTSUNRUS

Salem, Oregon

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Posted: 08/30/22 10:12pm

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TheOMB wrote:

Hi, I just did the same thing. I had Carlisle D rated ST tires on my trailer. At 80 lbs. it would most likely destroy my trailer. At 65 lbs. my E rated Goodyear Endurance tires have the same load rating as D rated tires do at the same pressure, 65 lbs. I set mine at 65 lbs. and the stiffer tire shook things loose that never happened before. I lowered them again, this time to 55 lbs. and all is well again.

Note: my trailer has a GVWR of 6,300 lbs. My pressure setting would most likely be too low for a heavier trailer.

According to the Goodyear Endurance inflation table, My size tire at 55 lbs. inflation = 2,270 lbs. each, X 4 = 9,080 lbs. That's more than enough for my trailer.

* This post was edited 08/30/22 10:19pm by ROBERTSUNRUS *

"> Bob ">
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austinjenna

Columbus, Ohio

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Posted: 08/31/22 05:06am

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I have the Goodyear Endurance and run them at 80psi as they suggest.

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Huntindog

Phoenix AZ

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Posted: 08/31/22 05:33am

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I have upgraded tires on all of my trailers except the present one, (which has the factory optional upgrade) and I always run them at max PSI. Lowering it just defeats a lot of the purpose of an upgrade. As you lower the pressure the increased capacity lowers as well.
I have never had an issue of a trailer shaking itself apart.
Treadwear, while not important for most, did not seem to suffer either. The tires aged out long before the tread wore down.

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