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Old 11-03-2013, 11:19 AM   #581
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Quote:
Originally Posted by SteveH View Post
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.
Hi,
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Old 11-03-2013, 11:46 AM   #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, 12:16 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, 01:06 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, 03:02 PM   #585
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Oh yeah, a Goodyear table for our Michelins.
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Old 11-03-2013, 08:11 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, 03:48 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, 06:35 AM   #588
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Originally Posted by field & stream View Post
........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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Old 11-06-2013, 06:37 PM   #589
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You can have 80 lbs. in a Load Range E tire and it will ride firmer and transmit that to the trailer. You will probably be putting into more air than necessary ti support the trailer. But more pressure means stiffer sidewalls, and some people prefer that. It is a tradeoff.

We settled on 72 psi on the 16" Michelins since the way the tire was wearing told me that was the right pressure—I used the trial and error engineering method.

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Old 11-06-2013, 07:31 PM   #590
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New shoes for our Airstream. Finally got it done. Sendel T-03 wheels and Michelins.
Thanks all for motivating me to do this. Took it for a ride today to seat the newly packed bearings and all's good for our winter trip.

See ya'll on the road sometime.

I tried to include photo's but didn't work. I'll try again.
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Old 11-06-2013, 07:47 PM   #591
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Here goes again with photo's.
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Old 11-07-2013, 10:08 PM   #592
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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
Okay, after 10,000 miles on our FC 25' rear bed with 16" Michelins at 80 psi, I am taking the advice and experience of Andrew T using the table to run at a lower pressure. CapriRacer has also suggested this may be correct.

Andrew T. uses the example of a Eddie Bauer with a motorcycle inside set at 50 psi, probably similar to our rear bed with travel load. It may be a while before I can get to a scale with travel load, so I am thinking in the 50-60 psi range would be our good for our Airstream with no loss of reliability.

I think a soft ride for the Airstream is important, have been concerned about it, and that is why I will reduce tire pressure.
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Old 03-23-2014, 11:49 AM   #593
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My own wheel / tire upgrade, following advice / recs from Phoenix

Completed today
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Old 03-23-2014, 12:23 PM   #594
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I went looking to see if Michelin published similar data to that from Goodyear. The only data I could find for RV use was for XPS Ribs. But I found this tire manual that has inflation data for use on light trucks as well as RVs.

http://www.tiregroup.com/Catalogs/PD...s/Michelin.pdf

According to the table for light truck service the load at pressure for the M/S, XPS Rib and others in truck service is the same. When I convert to 16" I'll probably use this data rather than inflating to 80 psi.

Al
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Old 03-24-2014, 06:04 AM   #595
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Quote:
Originally Posted by Al and Missy View Post
I went looking to see if Michelin published similar data to that from Goodyear. The only data I could find for RV use was for XPS Ribs. But I found this tire manual that has inflation data for use on light trucks as well as RVs.

http://www.tiregroup.com/Catalogs/PD...s/Michelin.pdf

According to the table for light truck service the load at pressure for the M/S, XPS Rib and others in truck service is the same. When I convert to 16" I'll probably use this data rather than inflating to 80 psi.

Al
Just be aware that those charts are MINIMUMS, not recommendations.

I'd recommend using an inflation pressure with a 15% grater load carrying capacity than the worst tire loading.

And if you don't have individual tire loadings, use an additional 10% if you only know the loading by axle and 15% more if you only know that loading for both axles combined.
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Old 05-27-2014, 12:01 PM   #596
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What is involved in the 16" up-conversion? Just wheels and tires or is there an axle/shock 'adjustment' also being done to accommodate?
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Old 05-27-2014, 12:04 PM   #597
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What is involved in the 16" up-conversion? Just wheels and tires or is there an axle/shock 'adjustment' also being done to accommodate?
Just wheels and tires. Some few units need a little cutting back of the trim at the trailing end of the wheel opening. Mine did on one side only.
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Old 05-27-2014, 12:05 PM   #598
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16" wheels/LT tires

Wheel, tire was all I needed. Clearances were fine. You may have to do some adjustments to the spare tire carrier to accommodate the larger tire.

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Old 05-27-2014, 01:41 PM   #599
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Just wheels and tires. I left the 15" in the spare and only bought four new tires, as recommended elsewhere in this thread or in one of the 500 other threads about this.
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Old 05-27-2014, 01:53 PM   #600
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I also kept my best 15" tire and wheel for a spare. Solves the spare tire carrier fit and saved me cash. I have no worries about traveling with the 15" spare if needed.
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