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Old 11-03-2013, 06:45 AM   #575
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Originally Posted by dkottum View Post
Good grief, just when I finally thought I had an answer . . .poof. I don't think I've got the patience to keep trying, hoping for a definitive answer for all us 16" Michelin users.

Thanks DBK'
DBK,

First you have to realize that there are experts and there are "experts" - and not everyone who seems to speak with authority is one.

Tire threads seem to generate a lot of chatter. Some of it is factual, some of it is opinion, and some of it is just pure drivel. If you chose to ask questions in a forum, your job is to sort it out.

If you are looking for a definitive answer, you need to go to a definitive source - and that would not be a forum where anyone can post a response. I would suggest calling a tire manufacturer - keeping in mind that the folks who answer the phone lines (or receive the emails) are NOT engineers - and engineers (the ones worth listening to) are going to want to know tire loads..

Ordinarily, I would point to the vehicle tire placard and declare that to be definitive because it is something required by law. The problem we are having is that unlike trucks and cars, where they have been subjected to severe scrutiny by the government, the trailer manufacturers are notorious for marginal tire sizing. That's why I keep insisting on knowing the weights. That's the only way to be definitive. Without them, it is merely a guess.
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Old 11-03-2013, 06:48 AM   #576
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Experience with 16" Michelin LTX

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Originally Posted by moosetags View Post
I have been running mine at 72 psi, based on Lucy's weight (7,400#).

Brian
You started this thread about the time I bought my trailer. It motivated me to make the switch from 15" GYM's to 16" Michelin LTX MS tires almost immediately.

I've been running at 74 pounds cold (I have a 27' Safari so it is a little heavier than your 25). Just returned from a 7100 mile trip from North Carolina to Colorado and New Mexico where a variety of towing conditions were encountered including temperatures from 25 to 101 degrees (on different days) and significant altitude change (often on the same day). I checked pressure every morning manually. Plus I use a tire pressure monitoring system when on the road. During the entire trip I never had to add air.

We did have two interior rivets pop out during this trip. I attribute the rivet loss to running over some extremely rough washboard roads and not the tire pressure.

I store my trailer inside a commercial warehouse on a concrete surface. I do not remove the tires when stored. The longest period of time the trailer has been stored without rolling on the road is 2-3 consecutive months.

The Michelin tires have almost 15000 miles on them after 2 years and still look new. The only issue I've experienced is one flat (screw in tread) which was repaired by the tire dealer. Needless to say I'm happy I started reading this thread when it began!
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Old 11-03-2013, 08:52 AM   #577
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Note that a one inch taller tire only raises the trailer by one half inch since the axle is in the center of the tire and half the increased tire height is both below and above the axle. Also, when inflated, the tire is not perfectly round as there is the flat area where the tire rests on the ground.
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Old 11-03-2013, 09:35 AM   #578
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Quote:
Originally Posted by Andrew T View Post
We have the best results carrying the correct tire pressure for the load the tire is carrying. The attachment is the RV load inflation table from Goodyear's website.
Here are the pressures for a 225/75R x 16 LT:

80psi 2680 pounds,
65psi 2335 pounds,
50psi 1940 pounds,
45psi 1790 pounds,
40psi 1650 pounds,
35psi 1500 pounds.

To use this chart you really should weigh your combination connected & loaded for travel on a sectioned scale.

For example the last Eddie Bauer I weighed with a customer was 6700 pounds on the axles (motor cycle inside) or 1675 pounds per tire. Generally I will add 10% to that number for variences in side to side load and the possibility that the scale is out a little so 1850 pounds per tire. Using the chart you could call it at 47 PSI but we went with 50 psi. 50 PSI has several advantages over 80 PSI; a smoother ride for the Airstream, shorter stopping distances espessially when wet and more even tread wear.

Some trailers & fifthwheels with corners are built with 225 Marathons right at their limit just over 10,000 pounds on tandem axles. In those cases we use the 225/75R x 16" LT with 80 psi.

From 1971 - 1984 a factory option on a new Airstream was Michelin 7:00 x 15" load range "C" tires. There were thousands of Airstreams built with these and tire trouble was very rare. I know many would say those trailers were lighter but actually many were not. The brochure weights in those days did not include options and everything was an option. By the time you added awnings, ac, double pane windows 2 door fridge etc. they weighed about the same as the new ones. Generaly 70's units tow a little easier because they are narrower and little more aerodynamic.

Years ago we could buy 225/75 x 16 Michelins in load range C which was a better match for most Airstream's but they are no longer available.

I know this is confusing and it is always easier to assume that bigger and heavier and more pressure has to be better but everthing has its compromizes.

Andrew T
Thank you very much, Andrew T. Finally a useful answer and something we can hang our hats on.
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Old 11-03-2013, 11:45 AM   #579
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I just downloaded the current file from the Goodyear website, and in very small print at the bottom it says:

[COLOR=rgb(13.725000%, 12.157000%, 12.549000%)]*Industry standards for load & inflation are in the process of being revised. These tables are current as of 01/01/05. For the most current information, please visit the RV Tire section of Goodyear’s Web site at Goodyear RV Tires. [/COLOR]




That was almost 9 years ago! Have things changed, or is this table still good?
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Old 11-03-2013, 11:57 AM   #580
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Being that Goodyear brings us the ST Marathon tire, and it's history, I'm not so sure I even care what they say my tire's inflation should be.
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Old 11-03-2013, 12:19 PM   #581
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Being that Goodyear brings us the ST Marathon tire, and it's history, I'm not so sure I even care what they say my tire's inflation should be.
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Old 11-03-2013, 12:46 PM   #582
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Yea, well, I might listen to them if I were inflating a blimp.
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Old 11-03-2013, 01:16 PM   #583
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Hi, I think if you could eliminate ST tires form Goodyear's product list, they actually have great tires. [one bad apple]
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Old 11-03-2013, 02:06 PM   #584
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I guess Goodyear must make a cajillion dollars on their marathons as they really give them a black eye. I used to buy exclusively Goodyear tires. After my Marathon experience on the Airstream, I have never bought another Goodyear tire of any kind.

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Old 11-03-2013, 04:02 PM   #585
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Oh yeah, a Goodyear table for our Michelins.
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Old 11-03-2013, 09:11 PM   #586
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The bottom line question for me was how many ST tires I have had ,including GYM's, have had the tread totally seperate and almost destroy my AS wheel well vs how many Michelin tires have I ever heard of that had a tread seperate. The answer was a whole bunch of ST's losing tread or side wall death and NONE on the Michelin side. Yes I have seen Michelin's have flats, on trucks, but you can't predict nails, but in 40 years of either running Michelins or knowing friends that run them, I have never heard of a tread seperation. Every failure of ST's for me have been tread seperation. I'll bank on Michelin LT's way before I will trust ST's on my AS, ever again.

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Old 11-04-2013, 04:48 AM   #587
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From Doug; Oh yeah, a Goodyear table for our Michelins.

I can see how you would wonder about that but this table is the same for every tire of the same size and type. Load inflations are done to an industry standard, that is why you will see every mnfr of a 225/75 E tire has the identical load capacity. The worst and best quality tire are treated equal. An ST tire has a different standard to meet than a LT tire so it gets a higher load rating on a less robust tire.

To put it another way, The Marathon is rated 400 pounds higher capacity than at 235/15 Michelin. You could put 225 Marathons on one side of an Airstream and 235 Michelins on the other and keep adding weight until you had a tire failure. I am certain the Marathon's would give out long before the Michelins did.

To give you an extreme example of this. We would often change 34's to 235/60R x 16" performance Michelins. The low profile tire rode smoother, handled nicely and it was like tossing out an anchor if you did a panic stop as well they just looked cool. We did about 100 of them starting in 1993. A couple of years ago a customer with one of these 34's hit a curb in Texas and bent his right front wheel on about a 20 degree angle. They did not have time to wait for an axle and had to get back to Ontario. If he had called me I would have sent him into a tire store to get 2 225 LT's put on for the trip home since he would be running on 5 tires. He did not call however he just drove it back to us. The 235/60 Performance tires were 35% over their load capacity looked half flat and yet ran 1500 miles and are still on it today. I doubt you would run an ST tire very far 35% over its capacity.

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Old 11-04-2013, 07:35 AM   #588
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........That was almost 9 years ago! Have things changed, or is this table still good?
The table would still be good, as these sorts of things do NOT change over time (except to make typo corrections) - BUT - new sizes are being added all the same, so the list might be incomplete.

And, yes, you can use a Goodyear table for a Michelin tire as these are industry tables and everything you see published is the same industry table regardless of manufacturer.

And one last thought: These industry tables are MAXIMUM load for a given inflation pressure. You should use the inflation pressure as a minimum, not a recommendation. (BTW, none of these tables ever say "recommendation". That should be a clue not to take them at face value.)
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