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Old 03-25-2019, 12:17 PM   #99
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Well, rmkrum - you clearly don’t have a flux capacitor in your trailer!
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Old 03-25-2019, 01:01 PM   #100
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Endurance Tire pressure on 27FB Int'l

Nope, last I checked, they are still on backorder...sigh.

And “Mr. Fusion” still is not on Amazon last I looked. Disappointing.

Yeah, I read a lot of Science Fiction as well. This cell phone I’m typing on is straight out of science fiction. Didn’t Tom Swift have one ? Or was it Jubal Harshaw—I don’t recall which was first mention.
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Old 03-25-2019, 02:58 PM   #101
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Endurance Tire pressure on 27FB Int'l

While there has been a lot or range comments on PSI for my new 225/75R 15 G/Y Endurance Tires so I decided to call Can Am Airstream of Ontario and gave them my stats on the 27FB loaded for camping , with a scaled weight of 6200 lbs on the axles ready to camp.



He stated that" I would be well in range @ 55lbs"and no higher than 60lbs.
He also stated that they would not send me out on the road any higher than that. .


I guess you guys that have posted those numbers are correct.....>>>or unless you disagree with the Tire MFG and the dealership that sells and services a lot Airstream Trailers.
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Old 03-25-2019, 06:31 PM   #102
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You are free...

...as long as you don't exceed the sidewall max pressure set by the tire manufacturer you are correct...the said table states the 'load limits' for various pressures.
You are free to set any pressure within those parameters, and be confident the Forum TP Police won't have any grounds to pinch your knickers.

Bob
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Old 03-25-2019, 09:05 PM   #103
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Well, the TP police may get their “knickers in a knot” during the spirited discussion...
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Old 03-25-2019, 09:52 PM   #104
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Quote:
Originally Posted by LAWBC View Post
While there has been a lot or range comments on PSI for my new 225/75R 15 G/Y Endurance Tires so I decided to call Can Am Airstream of Ontario and gave them my stats on the 27FB loaded for camping , with a scaled weight of 6200 lbs on the axles ready to camp.

You may have a scaled weight of 6200 pounds. The assumption is each tire/wheel is loaded equally or 6200 divided by the # of tires.

Frequently RVs and trailers in particular are loaded unequally. In that event a user could inflate all tires to the average weight. And at the minimum recommended pressure, some or one tire would be over loaded and the rest would have a good margin. That one or two tires would get stressed over the long haul and may have an early failure. Or at least be vulnerable to an adverse condition that otherwise could be handled and survive.

Most TVs or passenger vehicles do not have that issue.


>>>>>>>>>>>>>>>Action
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Old 03-25-2019, 11:11 PM   #105
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Just kidding of course but, NO ONE SHOULD BE TRAVELING 87 MPH TOWING AN AIRSTREAM. Check with AAA, DOT etc. Typically if speed post says 65 mph, its 55 mph for towed vehicles. Remember back in the day when signs were 60 cars/55 trucks. Rules still apply legally. Some speeds out west 75 & 80mph , that's for passenger vehicles on a clear day.

Interesting. I had an original brochure with my 1975. The copy was clearly written before 1973, and suggested that 70 mph was a normal towing speed. Airstream tires were 7.00x15 light truck tires back in those days.

The 55 limits are unreasonably restrictive on controlled access divided highways, where design speed is typically 80 mph. I tow at 60-65 mainly for fuel economy, but I’m fine with 70-75 with a good setup and proper tires. (Solo, I’m comfortable with a great deal more than that.)
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Old 03-25-2019, 11:15 PM   #106
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You may have a scaled weight of 6200 pounds. The assumption is each tire/wheel is loaded equally or 6200 divided by the # of tires.



Frequently RVs and trailers in particular are loaded unequally. In that event a user could inflate all tires to the average weight. And at the minimum recommended pressure, some or one tire would be over loaded and the rest would have a good margin. That one or two tires would get stressed over the long haul and may have an early failure. Or at least be vulnerable to an adverse condition that otherwise could be handled and survive.



Most TVs or passenger vehicles do not have that issue.





>>>>>>>>>>>>>>>Action


At 55 psi, those tires have a capacity of 2270lbs each, for a total of 9080lbs, if my mental arithmetic is accurate tonight. That will be fine even with the trailer loaded to its full GVWR.
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Old 03-26-2019, 06:56 AM   #107
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At 55 psi, those tires have a capacity of 2270lbs each, for a total of 9080lbs, if my mental arithmetic is accurate tonight. That will be fine even with the trailer loaded to its full GVWR.
Don't be so sure of that.

The tires could be unevenly loaded - I've been using 15%, but 10% might be closer to the worst case.

The tires shouldn't be loaded to more than 85% of their rated load.

The load tables for ST tires are set up for 65 mph, and if you want to tow at 75 mph, you need to reduce the load by 10%.

And if you want to tow up to 85%, the loads have to be reduced a further 10%.

Doing the math, this worst case results in tire load carrying capacity of 5674# - compared to a 6200# GVW.
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Old 03-26-2019, 10:26 AM   #108
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ST tire Load & Speed

Before anyone jumps on Capri here is a shot from USTire & Rim Association standards book.


Note the adjustment for inflation and loading based on operating speed


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Old 03-26-2019, 01:05 PM   #109
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Endurance Tire pressure on 27FB Int'l

Quote:
Originally Posted by ROBERT CROSS View Post
...as long as you don't exceed the sidewall max pressure set by the tire manufacturer you are correct...the said table states the 'load limits' for various pressures.
You are free to set any pressure within those parameters, and be confident the Forum TP Police won't have any grounds to pinch your knickers.

Bob


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Quote:
Originally Posted by rmkrum View Post
Well, the TP police may get their “knickers in a knot” during the spirited discussion...

as you say and its coming.

Decided to set ,, ,,,,,,,,,,,,55.0 PSI
and that number gives me + 30% margin .

I have considered, what if I get a flat at highway speed of 65 mph. Will the other tires be able to compensate, considering not all tires carry the same load ?

The answer is if it happens the margin is there.
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Old 03-26-2019, 01:06 PM   #110
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I would assume the inflation numbers regarding speeds greater than 65 MPH on the bottom of that chart only pertain to ST tire design.

For LT tire designs would there be a pressure or load adjustment for speeds greater than 65 MPH?

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Old 03-26-2019, 02:58 PM   #111
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Quote:
Originally Posted by Tireman9 View Post
Before anyone jumps on Capri here is a shot from USTire & Rim Association standards book.


Note the adjustment for inflation and loading based on operating speed


And I note, the date on this chart is 2010....think the technology and compounds might have improved a little...just a little by now?? I still am putting my faith in the Mfg. recommended chart, in my case GY for the Endurance tires I am running.

Lots of experts and experience here for sure, so go with what you feel most comfortable with. I can only repeat as others have noted, the Endurance tires when at or near "Max" pressure of 70lbs on my AS gave me popped rivets, broken hinges via stripped screws on doors, and a generally rough or stiff ride. Don't have that issue when running at the PSI of between 45-55PSI for my 28's weight.
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Old 03-27-2019, 06:18 AM   #112
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And I note, the date on this chart is 2010....think the technology and compounds might have improved a little...just a little by now?? ….....
Actually, it's a law of physics kind of thing.

Quote:
Originally Posted by gypsydad View Post
…… I still am putting my faith in the Mfg. recommended chart, in my case GY for the Endurance tires I am running, ,,,,,
And my comments weren't specific to a certain make and model of tire. In your case, the speed rating overrules the 65 mph speed restriction (and the adjustments for higher speeds) - however, that doesn't apply to tires that don't have speed ratings (or more precisely, those who also have speed ratings in the 65 mph range.)

Quote:
Originally Posted by Action View Post
I would assume the inflation numbers regarding speeds greater than 65 MPH on the bottom of that chart only pertain to ST tire design.

For LT tire designs would there be a pressure or load adjustment for speeds greater than 65 MPH?

>>>>>>>>>>>>>>>>Action
Sort of.

Ya see, LT tire load charts are also predicated on a 65 mph speed restriction - HOWEVER - if an LT tire has a speed rating that speed rating becomes the speed limitation - AND - since pretty much all LT tires have them, the 65 mph speed restriction doesn't apply.

The same is true of ST tires. If an ST tire has a speed rating, the 65 mph speed restriction is replaced by the speed rating - and as gypsydad pointed out above, he is using Goodyear Endurance ST tires which have an N speed rating (87 mph).
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