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Old 06-15-2016, 11:07 PM   #15
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Originally Posted by Mrjkq View Post
First of all GMT are junk tires, just about everyone on this forum agrees, now over inflating them is plain stupid, they blow out at 65psi @ higher pressure it will just be louder & quicker. Change them out to Maxxis E rated or Michelin LT tires.
Nobody is recommending inflation over 65 psi. Just 10 lbs over the recommended inflation for the weight of the trailer.
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Old 06-15-2016, 11:20 PM   #16
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Originally Posted by mrprez View Post
Nobody is recommending inflation over 65 psi. Just 10 lbs over the recommended inflation for the weight of the trailer.
The AS sticker says inflate to 65psi on GMT, not depending on you weight.
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Old 06-16-2016, 08:15 AM   #17
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AS didn't make these tires. Goodyear did. I would think GY knows more about it than AS.
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Old 06-16-2016, 09:58 AM   #18
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It is my belief that the inflation pressure in the tables is the minimum pressure to support the stated load, not the maximum, and one can inflate up to the maximum pressure on the sidewall without negative effect on the tire. But like others have stated, I don't have to worry about this because I put on the 16" Michelins.

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Old 06-16-2016, 10:01 AM   #19
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Quote:
Originally Posted by mrprez View Post
AS didn't make these tires. Goodyear did. I would think GY knows more about it than AS.
Goodyear doesn't know what load is placed on the tire, or what additional stresses (tandem axles, etc.) are imposed. Airstream does. Per FMVSS the vehicle manufacturer, not the tire manufacturer, is responsible for posting the required inflation for a specific tire on a specific vehicle.

IMHO, YMMV, etc.

Al
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Old 06-16-2016, 10:30 AM   #20
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I just found that GY says if you want to tow your trailer at speeds above 65
Just add 10psi to your max cold air pressure.
Anyone doing this ??
mike
Only if you want to trash your investment in the Airstream sooner and at a higher speed than the recommended 60 MPH towing speed.
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Old 06-16-2016, 10:32 AM   #21
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I should add that the best and safest use for GYMs is on completely stationary trailers that never move from their RV pad.
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Old 06-16-2016, 11:34 AM   #22
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^ This will age set your axles from non use. The rubber torsion bands need exercise to stay viable as a spring. Check you axle info that comes in the owners packet of warranty & use instructions.
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Old 06-16-2016, 11:54 AM   #23
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"Goodyear doesn't know what load is placed on the tire, or what additional stresses (tandem axles, etc.) are imposed. Airstream does."

I agree that GY does not know what load is applied in an eventual application. It must be up to the application builder to determine that and then using information from the tire manufacturer determine the tire and its pressure. As far as AS knowing the stresses, I don't know how they would. They told me that they do not have dynamic models of the trailers and they do not appear to be the type of company that would go and actually measure some technical data.
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Old 06-16-2016, 12:10 PM   #24
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The gym already comes equipped with an auto explode feature why help accellerste that function by puffing it up more and then making it spin faster?

Now that's funny
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Old 06-16-2016, 12:36 PM   #25
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Hmm...
Seems like they would just explode or separate sooner...
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Old 06-16-2016, 01:20 PM   #26
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I wonder if AS uses the same inflation sticker on all trailers regardless of size.
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Old 06-16-2016, 01:24 PM   #27
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You may do that, however the increase is above the reocmmended inflation pressure for your load. not above the max pressure on the sidewall.

So if your recommended inflation is 55 psi for your load, then you can go up 10 psi to 65 psi, but you cannot go above 65 psi maximun cold inflation pressure.
Mark's info above is correct. Several manufacturers allow this, Maxxis and a couple others in writing. For example, I run Maxxis "E" rated ST tires on my 30 FC. Without looking at the charts, I believe the weight of my 30 requires somewhere close to 50 psi to carry the load. I keep the 4 tires at 75 psi so, when doing 70 to 75 mph downhill, I'm not concerned.
With the LT tires that many have gone to, the speed restriction is not a factor. But they have given up sidewall strength and thus some protection against side shearing forces. Take a look at your tandem tires during a sharp backing turn. That's one reason why ST tires are recommended for twin axle trailers. However, if you want to drive fast, buy LT tires.
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Old 06-16-2016, 01:31 PM   #28
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My Marathons have about 18,000 miles on them now after 3 1/2 years. No problems of any kind. I run TPMS, keep them inflated to 65psi and rotate them front to back annually. Will age out late 2017.

I confess to never towing past 65 mph and I avoid curbs and potholes as best as I am able.

I guess I am the lucky outlier who proves the exception to the rule.
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