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Old 10-19-2017, 10:02 AM   #1
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Tire pressure

I have Good Year Endurance.
I'd like a rough idea of inflation pressure.
If I look at GY's inflation specs, it says, "Maximum 80 psi".
Now I don't think very many folks are running with 80 PSI, so I consulted the GY inflation chart.
If my AS weighs 7000 pounds, minus about a thousand on the tongue, that leaves 6000 pounds over four tires or 1500 each. Is that logical? The chart says I should have 25 psi! No.
What am I doing wrong?
What do you successful streamers run with?

http://www.goodyearrvtires.com/pdfs/rv_inflation.pdf
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Old 10-19-2017, 10:53 AM   #2
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I'm no expert at all in this subject (or any really).
However, could you be misinterpreting the chart?
Maybe the chart is showing the load limit at specific inflation, not the other way around?

I found this on etrailer from one of their 'experts' (for what it's worth): "Trailer tires, which will have an ST in front of the size, should always be inflated to the maximum psi indicated on the tire. Trailer tires usually do not have a recommended and maximum psi indication"
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Old 10-19-2017, 11:18 AM   #3
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I have a 2012 25 FT Flying Cloud and there is sticker on the trailer that states tire pressure is 65lbs front and rear. Hope this helps. Also you might want to check your manual or call your dealer regarding tire pressure.
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Old 10-19-2017, 11:34 AM   #4
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Good question ... following, as I've got new Endurance rubber on the Bambi.

The Goodyear table appears to suggest something like 30 pounds.
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Old 10-19-2017, 11:36 AM   #5
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Quote:
Originally Posted by urnmor View Post
I have a 2012 25 FT Flying Cloud and there is sticker on the trailer that states tire pressure is 65lbs front and rear. Hope this helps. Also you might want to check your manual or call your dealer regarding tire pressure.
My 2017 says that same thing (65 psi). However it (and probably yours) came with GYM's which are rated at 65psi.

I'm not an expert either but If I had the Endurance tires, I'd inflate to the max sidewall pressure to keep sidewall flex to a minimum.
I think the concern about vibration in the trailer due to tire inflation may be mis placed unless you normally drive down washboarded roads at 50mph. My guess is tire/wheel balance is more to blame for trailer vibration and having everything thrown around. That's what centramatics are for.
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Old 10-19-2017, 11:42 AM   #6
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Other SOB owners wondering same thing.
Found this post on the Forest River forum:
"I called Goodyear direct and was told to use the trailer manufacturers recommended inflation."

I think I am inflated to around 70-75 on my 26U.
Certainly will double check, though, before heading out this weekend.
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Old 10-19-2017, 11:58 AM   #7
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Still learning all this stuff myself.
Does any of this below make any sense?

I think the way you read the chart is as follows.
Take size ST225/75R15 (what I have on my 26U):
If inflation is 30lbs, then MaxLoadLimit is 1600.
If inflation is 65lbs, then MaxLoadLimit is 2540.

So does this mean if dual axle TT and the weight evenly distributed across all 4 tires, then 65lbs per tire means I have a MaxLimit of 10160 for the TT?
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Old 10-19-2017, 12:01 PM   #8
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I too am no expert. I have read somewhere here on the forum that Airstream is telling their customers with Endurance tires to inflate to 65PSI. I was also told by another reputable AS repair tech that inflating Endurance to max pressure will beat your trailer to pieces. I have been running mine at 65PSI cold inflated.
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Old 10-19-2017, 12:24 PM   #9
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I've become a maximum sidewall guy based on the tire engineers that often post on this forum and Airstream's recommendations. I actually run 80 PSI in all eight LT tires on my rig. I set them at 80 PSI cold in the 90+ degree Florida "shade", which then drops to about 77 PSI cold when up north. My truck weighs 8950# when pulling my Airstream and my tire pressure increases about 15% when traveling, therefore max pressure is needed on the truck. And since Airstream recommends Max sidewall pressure, they must be more concerned with interply sheer than a soft ride for the Airstream, so its 80 PSI all the way around the rig for me.
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Old 10-19-2017, 12:29 PM   #10
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Quote:
Originally Posted by MWBishop View Post
Does any of this below make any sense?

I think the way you read the chart is as follows.
Take size ST225/75R15 (what I have on my 26U):
If inflation is 30lbs, then MaxLoadLimit is 1600.
If inflation is 65lbs, then MaxLoadLimit is 2540.

So does this mean if dual axle TT and the weight evenly distributed across all 4 tires, then 65lbs per tire means I have a MaxLimit of 10160 for the TT?
Yes. But why put out a chart if it doesn't help you determine the correct tire pressure? Just the max load limit, which you won't reach? I'm scratching my head.

Quote:
Originally Posted by AirMiles View Post
My truck weighs 8950# when pulling my Airstream
Your truck weighs 8950#?
Mine (similar) weighs a little over 5000#. Where did you get an additional 3500#? Cat scale? (I haven't done that yet.)

I was a bit shy about asking here, because I figured the subject was beaten to death, but a search showed a lot about Marathons, and not much about Endurances.
My dealer was nice enough to swap my 2017 Marathons, for 2018 Endurances, so a sticker probably will be inaccurate.
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Old 10-19-2017, 12:39 PM   #11
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Yep, I struggle to keep my truck under its 8950# GVWR on the CAT scale with the Airstream attached: http://www.airforums.com/forums/f42/...ml#post1950225
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Old 10-19-2017, 01:04 PM   #12
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Interply Shear (not sheer). Here is the tire engineer's website link on the subject and his recommendation to run Max Sidewall Pressure. http://www.rvtiresafety.net/2013/11/...no-babble.html
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Old 10-19-2017, 01:10 PM   #13
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I think you were reading the chart the wrong way. Look for a reasonable tire pressure (e.g. 45psi) and read down to see if it has adequate load carrying capacity. e.g. the line for ST225/75R15 is telling you is that for 25psi the maximum load is 1430 lbs, and for 45psi the maximum load is 2020 lbs. I run 45psi cold in my Michelin tires. This provides a better ride for the TT and has adequate carrying capacity for my trailer/tire combination. You might want to inflate the spare to a higher psi such as 65-70 lbs so that if you had two flats on the same side you could run with the one spare until you got off of the highway.
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Old 10-19-2017, 01:58 PM   #14
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Load & Pressure Table not applicable for tires in trailer service. Read Roger Marble more carefully.

An ST tire is already a risky choice.


For best tires Need individual tire loads:

Need to weigh trailer with and without WD applied (Three Pass Method) to set up hitch.

Second step with trailer is (WD applied) to do an axle split (ask Cat Scale operator for assistance).

Final step would be split with but port or starboard tires only on scale.

Assuming TT had full propane and fresh water in above, and had a suitably representative camping load aboard, one is looking for heaviest position per axle.

Still better off with full sidewall pressure.

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Old 10-19-2017, 02:50 PM   #15
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Quote:
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Load & Pressure Table not applicable for tires in trailer service.
Why then does Goodyear publish a table for this tire? Maximum sidewall pressure beats the heck out of your TT for NO benefit.
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Old 10-19-2017, 02:59 PM   #16
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Why then does Goodyear publish a table for this tire? Maximum sidewall pressure beats the heck out of your TT for NO benefit.
Run them for awhile at 45 psi then touch the sidewall. They get hot!
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Old 10-19-2017, 03:00 PM   #17
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And pressure in excess of that needed to carry the load will lead to excess wear in the centre of the tread...
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Old 10-19-2017, 03:25 PM   #18
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Why then does Goodyear publish a table for this tire? Maximum sidewall pressure beats the heck out of your TT for NO benefit.
I suggest you review the technical info on the blog post on "Interply Shear" it covers the "why"
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Old 10-19-2017, 03:25 PM   #19
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Run them for awhile at 45 psi then touch the sidewall. They get hot!
During a summer 5,000 km trip and using the data from at my TST TPMS, my Michelins go up about 5 psi and 5-10 įF at 60 mph. I don't consider that hot.
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Old 10-19-2017, 03:30 PM   #20
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Goodyear chose to publish the same Load & Inflation numbers for both the marathon and the Endurance.

While there are construction features that can be included in tires to make them more tolerant of abuse (overload, underinflation and cornering forces) IMO I do not know what features could be applied to an ST tire to achieve the higher load capacity and the very high speed rating.

If Gy engineers have some magic to allow tires with "ST" on the sidewall to support +10% to +20% more load than an identical size LT tire, why don't they put the magic rubber in their top line LT and Passenger tires to increase their load capacity?
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