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Old 09-04-2009, 09:45 AM   #127
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Special Trailer Tire Class

Observation: The heaver a tire load is the more trouble you have with the ST tire. 31FT, to 25 ft seem to have the most trouble. The 34 FT dont seem to have as much trouble as the double axle. This can be attributed to tire loading in my mind. It seems that when you approach 50% of the ST tire's load carrying capacity at highway speeds you have failures.
Fact: The ST class of tire is a 65 MPH tire. 65 MPH is all the NHTSA requires them to be tested and type certified to.

Fact: Tire companies are not going to put expensive high temperature (99mph+) compounds in a tire that they only have to build to withstand the NHTSA 65 MPH testing. To do so would not maximize profits.

Fact: Elevated temperature is what causes the rubber compounds to loose their integrity and release (melt and come apart). Remember NASCAR and their tire debacle a couple of years ago? Wern't those Goodyear tires?

Fact: Those who put the Load Range E tires on their trailers usually put higher air pressures in them. The sidewalls flex less and generate less heat and so they seem to last longer. Truth is any pressure over 60 PSI in the 31 ft trailer is producing a ride that is damaging their trailer. Reffer to the inflation tables for the proper pressure for the load the tire has to carry.

Fact: The higher the Speed Rating of a tire the more heat it can withstand and not disentegrate.
So,
We dont need higher load range tires, just tires that will withstand the heat of 65 MPH on a hot summer day, inflated to the PROPER pressure to carry the load on the tire.

Even simpler, we dont need higher capacity tires just better tires.
Beginner
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Old 09-04-2009, 10:40 AM   #128
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Hey All,

It's summer and the GYM stories start appearing. We originated this thread and it is about time that we bring everyone up to date with our experience with Michelin XPS ribs. We now have 22,000 miles on the tires after 3 years, which includes one trip to Florida and 2 cross country trips to California from our home in North Carolina. During this summer's trip we spent a day driving across Oklahoma where the temperature reached 109 degrees. I do not see any appreciable wear (at most 1/32") on the tires. Sidewalls are in perfect shape. This next statement may seem heretical to most Airstreamer's, but I expect to get over 150,000 miles and 20 years of use per set of XPS ribs. The reason I believe this is that I have a 12000 pound utility trailer which has 10 year old XPS ribs. The tires look brand new, even though the trailer sits outside unprotected on my log yard, ready for use whenever I need it. A couple years ago one of the tires on the utility trailer went flat. I found a 3/8" bolt stuck in the tread. I took the tire in for a plug/patch, thinking at the time that the tire was probably ruined. To this day, the tire still keeps air and rolls true. One of our WBCCI unit members followed our lead and installed XPS ribs on his 2005 30' Classic after 2 out 4 of his original GYM's separated. After 2 1/2 years, he reports no problems or wear. The quality of this make of tire convinced us to spend the money and buy a set of 245's for our new tow vehicle, a 2002 Ford Excursion. They run quiet and show no wear after 8000 miles. Yes, we do pay a lot of money up front for these tires, but a separated GYM destroying the galley in our trailer would be much more expensive. Let me now step down from my soapbox.

Bye

Paul
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Old 09-04-2009, 10:57 AM   #129
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Worried

I am going to replace my axle/rims/tires in the near future - I am really interested in the outcome of this thread. I was going to replace them with ST 225/75/15 on new rims, but am unsure now. Might have to upgrade to 16's.
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Old 09-04-2009, 11:16 AM   #130
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It sucks that the XPS doesn't come in a 15", because I don't want to go to a 16", given that I like the look of the original wheels on our Sovereign. From what I read, Maxxis seems like a good tire to put on. We have had Carlisle tires on, since the day we bought the Sovereign and have never had a day's problem with them and we easily have 20,000 miles on them, in the last four years.
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Old 09-04-2009, 06:45 PM   #131
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Man that is a scary picture of those Marathons!

I guess I'll stick with my Maxxis UE-168 LT/ST tires. I've had them for two years, nary a problem at all. I've pulled them at over 80mph. I like my triple axle
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Old 09-04-2009, 07:54 PM   #132
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I once had a fifth wheel with faulty Carlisle tires that came apart. Then I had a 40' Holiday Rambler DP with Goodyears that were bad. After reading this thread I just went out to see what kind of tires that are on my '09 Flying Cloud that I just bought and found Goodyear Marathons, made in China. Now I have to make a decision whether to take off brand new tires and replace them to keep from tearing up my new AS. Seems to be a pattern here.
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Old 09-05-2009, 05:35 AM   #133
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If it gets to where I can't find these Maxxis tires anymore, I'll do the wheel swap and run 16" BFG Commercial TA's. That really is the right route to go. Wheels aren't cheap though, and I need six of them.

I've never had a bit of trouble with either BFG or Michelin. Actually, I believe that Michelin owns Goodrich now.
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Old 09-05-2009, 10:21 AM   #134
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Quote:
Originally Posted by JimGolden View Post
....Actually, I believe that Michelin owns Goodrich now.
Jim, they do own BF Goodrich now. Where did you get your Maxxis UE-168 LT/ST tires? I was only able to find Maxxis 8008 trailer tires...didn't see the others on their site.
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Old 09-05-2009, 10:30 AM   #135
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After two years since I converted to 16" wheels, and Michelin E rated tires, I continue to be pleased with the results. The comfort in knowing that the tire is not going to fail is priceless.

Alos, as an FYI, a couple of weeks ago I heard the CEO of Carllisle on CNBC say that they were moving their production back to the US from China.

Pictures of tire and wheel below;
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Old 09-05-2009, 10:56 AM   #136
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I recently removed my marathons from my 19ft Bambi--3.5 years old, about 15,000 miles--in preparation for a trip to Alaska. The tire guy and I noted blistering or separation of the inner liner of the tire from the tread. This clearly is abnormal and may represent one of the steps in the failure of these tires--made in China.

Replaced with E rated Maxxis. So far so good. No problems in Alaska.
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Old 09-06-2009, 05:25 PM   #137
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Stingray,

I got six of my UE-168's from Go Forth Tire in Knoxville, TN, when I bought the trailer (it had Michelns on it but they were 15 years old and dry rotted). Nobody where I live carries them, but you can mail order them.

Here's a place that carries them. I run the 235/75 15 in a Load Range D.
Where I got mine had the 235's in 8 ply (D), and the 225's in 10 ply (E). But, it looks like you can get the 235 in a 10 ply as well.

Here's a place that has them for $123 each. Not too bad...I paid about $98 for mine two years ago. Unser Tire used to carry them and that's where I got my spare and mounted it locally.

Gripston - Search

Hope this helps. See ya on the road,
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Old 09-06-2009, 06:47 PM   #138
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Quote:
Originally Posted by Steamy1 View Post
... I converted to 16" wheels, and Michelin E rated tires, I continue to be pleased with the results. The comfort in knowing that the tire is not going to fail is priceless.
As the owner of a single axle trailer, I'd sure like to know what that feels like. Would you please tell me what brand wheels did you get, and at what PSI do you run the load range E tires?
Thanks.
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Old 09-06-2009, 07:20 PM   #139
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Jim,

It helps a great deal, thank you so much. The biggest question I have relates to Load Range. I've always heard that, if you bump up to a higher Load Range, the ride is going to be much harsher. True?

According to all of my original literature, our Sovereign is supposed to ride on 7.00x15 LRC tires...what we have on there now are the Carlisle 225/75 ST15 LRC. I just measured inside the fender and I have 2" of clearance on either side of the tire (to the fender and to the frame), and I have 4.75" to the top of the fender.

I wonder what the largest 15" tire I could get away with would be?

Quote:
Originally Posted by JimGolden View Post
Stingray,

I got six of my UE-168's from Go Forth Tire in Knoxville, TN, when I bought the trailer (it had Michelns on it but they were 15 years old and dry rotted). Nobody where I live carries them, but you can mail order them.

Here's a place that carries them. I run the 235/75 15 in a Load Range D.
Where I got mine had the 235's in 8 ply (D), and the 225's in 10 ply (E). But, it looks like you can get the 235 in a 10 ply as well.

Here's a place that has them for $123 each. Not too bad...I paid about $98 for mine two years ago. Unser Tire used to carry them and that's where I got my spare and mounted it locally.

Gripston - Search

Hope this helps. See ya on the road,
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Old 09-06-2009, 07:55 PM   #140
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Stingray

check this out
csgnetwork.com/tireinfocalc.html
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