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Old 10-20-2015, 11:19 AM   #29
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I wonder how many cubs this tire has hit ?

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Old 10-20-2015, 01:26 PM   #30
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Side wall tire damage. Tire at end of it's useful life for an ST tire. Not in the sun? Not being sarcastic but not sure how one tows a trailer and not have the tire in the sun. Is it covered at all campgrounds? If a tire is outside and not covered it's subjected to UV rays.


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Old 10-20-2015, 01:30 PM   #31
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Running gear not properly balanced.

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Old 10-20-2015, 01:56 PM   #32
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My personal opinion based on my experience in sunny New Mexico is tires age out before they suffer serious UV damage. If I'm wrong post some facts (not more opinions)
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Old 10-20-2015, 02:11 PM   #33
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What does a professional tire engineer have to say about this topic (and others)?
RV Tire Safety: UV
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Old 10-20-2015, 02:19 PM   #34
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Back in 1971 I bought my first new vehicle, a Ford Econoline van. The van had multiple issues with "blisters" forming on the passenger side front tire. Within a short time another blister would form on yet another tire (8ply side walls). A short distance from the Ford dealership was a shop that specialized in bending axels. The axel would be chained down and a hydraulic jack would push up. A line of Fords would form before PeeWee's shop would open. One trip to PeeWee's shop solved my problem with tires blistering. The memories that photo brought back.
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Old 10-20-2015, 02:34 PM   #35
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Originally Posted by cwf View Post
What does a professional tire engineer have to say about this topic (and others)?
RV Tire Safety: UV
Good article. thanks for the facts.
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Old 10-20-2015, 05:40 PM   #36
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I had a similar budge develop on the front tire on my motorcycle once. A high quality Metzeler tire. Happened on a ride when the bike was carrying two plus our luggage and we had just ridden over Tioga Pass in Yosemite at nearly 10,000 feet elevation. I always suspected a combination of excess weight and extreme elevation as a possible cause. Fortunately, no blowout and we made it safely home where I replaced the tire immediately. The bulge on my tire was not as bad as on this one.
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Old 10-20-2015, 05:56 PM   #37
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Originally Posted by rmkrum View Post
Seriously it looks like air leaked between layers of the tire, as a guess a manufacturing defect or weird damage. Another reminder to use better tires😞😞

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Better yet, Airstream should just change to better tires
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Old 10-20-2015, 05:56 PM   #38
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IMHO - that part of the tire is severely under-cured. Tires should not allow expansion of rubber to that degree.

For those who want a little more detail:

I like the following analogy: molecules of rubber are like spaghetti. If there is no cross-linking in the rubber, they behave just like well cooked, oiled spaghetti. They move like thick cream and there is no strength or rebound.

An elastic band is dried rubber with a little bit of cross linking. It's like spaghetti that wasn't well rinsed. It can be stretched and will recover its shape.

A tire should have a lot of cross-linking for much better strength. It is like spaghetti that wasn't rinsed and is strong and rigid.

Rubber chemists measure elongation and tensile strength. The more cross linking present, the lower the elongation and higher the tensile strength. The last thing you want in a tire is a stretchy (high elongation), weak (low tensile strength) cure in your rubber.

This points to very poor or missing quality control. This is rubber science, not rocket science.
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Old 10-20-2015, 06:20 PM   #39
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Ya' got to love the Airforums threads that are literally 100% speculation from people that do not have a clue as to what actually happened. 😜
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Old 10-20-2015, 08:19 PM   #40
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Sometimes a SWAG* is all we have available in analyzing stuff that's unusual...

C'mon Chief, we were in the same Navy, so smart guessing is sometimes all you have....especially for the weird stuff....

*Scientific Wild Ass Guess

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Old 10-20-2015, 08:36 PM   #41
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Pure speculation but it reminds me of Cindy Crawfords mole......
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Old 10-20-2015, 09:06 PM   #42
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Goiter is appropriate.

We replaced several Marathons on our dual axle boat trailer one year. Then, while returning from the Keys, we lost 2 more. We got lucky and bought the last of the needed size tire from the Okeechobee Wal-mart before they closed on a Saturday night (not Marathon!).

The first tire developed a small bubble heading down the Turnpike and was pointed out by a concerned truck driver about the time I noticed the fender bouncing. They don't ride smoothly with a bubble. We were able to change it. The second blew before we got too much farther. We had to put the bubbled tire (nothing like the bubble shown; just a raised lump) on to limp into town and by then the bubble had grown, similar to the one pictured. Goiter is really appropriate. Naturally the kids (and I) thought it was pretty funny, but from a distance and I had them move away further. Seconds later it blew. We drove to a more public area, unhitched the trailer, left my wife sitting on the leaning post under the T-top reading her book, and went in search of a tire late on a Saturday evening. More than a few people stopped and asked her how the fishing was.

The bubble shown looks similar to how our tires acted. I wouldn't feel too safe standing around looking at a goitered tire under any pressure. Anyone that's experienced tire failure will understand. It seems this was typical with Marathons at the time. The Goodyear dealer replaced all the tires (this after I had already had about 3 of the 5 replaced and lost another two on this trip) with Carlisle. Terrible tire but good customer service.

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