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Old 06-17-2009, 01:21 AM   #1
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Bulletin about Marathon air pressure

If this has already been posted, sorry. http://www.tirerack.com/images/tires...plications.pdf

Bob
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Old 06-17-2009, 06:51 AM   #2
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Good posting Bob. Unfortunately, some of us may have learned this the hard way .
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Old 06-17-2009, 08:05 AM   #3
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Bob - thanks for bringing that up again. That bulletin has a link that eventually gets me to something 2air originally posted and I was wanting to see again -- http://www.goodyear.com/rv/pdf/rv_inflation.pdf

Karma time!
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Old 06-17-2009, 08:51 AM   #4
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I to find it very interesting that Goodyear does not even refer to their own inflation chart in this service bulletin. If you are going to increase the tire pressure 10 lbs they should at least give some indication of what pressure to start from.

http://www.goodyear.com/rv/pdf/rv_inflation.pdf

No wonder there are so many problems with their tires if they don't even know where to start from.
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Old 06-17-2009, 10:18 AM   #5
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The D Load range tire is stated on the sidewall to be inflated to 65 psi. The C-load rated tire is to be inflated to 50 psi. (I have been fortunate to use Marathon trailer tires and NEVER have a failure) I NEVER tow above 60 mph and I check the tires for safe condition and proper air pressure at the beginning of EVERY day.
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Old 06-17-2009, 11:21 AM   #6
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The reasoning in the increased tire pressure at the higher speeds is to minimize some of the flex in the tire. That flexing builds up heat which in turn if excessive, causes the tire to fail. The inverse of this is if you read Airstream's instructions on towing a tandem axle you will note that a single tire can carry the load at reduced speed. The reason is that at reduced speed the tire generates less heat which in turn gives you an increased tire capacity.

We tend to harp on inflation pressures but there is less talk on what speed does to tire capacities. I sure wish manufacturers would put out a chart showing max inflation pressure, and how speed affects load capacity.

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Old 06-17-2009, 12:46 PM   #7
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Take note of this Goodyear item

"IMPORTANT: It's a common practice for RV owners to lower tire pressure in their search for a smoother ride. This is not only dangerous, it's relatively ineffective, as the difference in ride quality is not significant. When minimum inflation pressure requirements are not met, tire durability and optimum operating conditions are compromised. Tire inflation pressure should always meet at least the minimum guidelines for vehicle weight."

I ran across a page, I think at Goodyear, that recommended that trailer tires be inflated to the pressure listed on the sidewall as max cold psi. I should have saved the link for that one. While it illustrates some of the confusing specifics of recommendations, it also follows the general concept the list important as noted above. I note that Discount Tire has this max reccomendation for trailer tires. (good summary of other ST tire information there, too).

As for speed, that is a heat rating. There is an interesting comment at TireRack "It is important to note that speed ratings only apply to tires that have not been damaged, altered, under-inflated or overloaded." - see also their note on Air Pressure/Load Adjustment for High Speed Driving

I think they key is to not get obsessed with an accuracy that doesn't reflect the real world. That is why the max sidewall and appropriate driving considerations are a good start.
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Old 06-18-2009, 04:09 AM   #8
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If this has already been posted, sorry. http://www.tirerack.com/images/tires...plications.pdf

Bob
Just an FYI - in ref to adding 10lbs (cold) for increased speeds.
Check the date on the bulletin = '06.
This was *before* GY sent Marathon mfg to China.

IMO - not a good idea then or now (even if-? Marathon mfg may have returned to the US).
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Old 06-18-2009, 10:40 AM   #9
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The .pdf bulletin states "Do not exceed the maximum pressure for the wheel"
Where do I find that info on my aluminum wheels?

Lou
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Old 06-18-2009, 11:12 AM   #10
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The .pdf bulletin states "Do not exceed the maximum pressure for the wheel"
Where do I find that info on my aluminum wheels?

Lou
The manufacture states it on the box if you bought them after market or if they are Airstream OEM they can tell you.

Every wheel has a load rating and Max. pressure rating.
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Old 06-18-2009, 01:15 PM   #11
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Didn't I read here on the forums that it is stamped somewhere on the wheel? Maybe on the inside? Can't remember.

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Old 06-18-2009, 01:27 PM   #12
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Produce Service Bulletin

The service bulletin .pdf states "If the maximum pressure for the wheel ..." Where do I find this information for my aluminum wheels?

Lou
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Old 06-18-2009, 01:46 PM   #13
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I believe the max pressure for the rims is 80psi.

IMHO, and again this is just my opinion (not trying to start a flame war here), I can't see driving (in my case) 6.5 tons of vehicles more than 65mph. Besides the MPG hit, if I am on vacation, I am typically not in a big hurry and an even less hurry when I am on route back home.
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Old 06-19-2009, 03:11 AM   #14
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The service bulletin .pdf states "If the maximum pressure for the wheel ..." Where do I find this information for my aluminum wheels?

Lou
"Usually" (but not always) stamped on the back side of the wheel.

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