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Old 10-21-2015, 10:49 AM   #43
cwf
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Wow.. That is too many failures to tolerate.
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Old 10-21-2015, 02:44 PM   #44
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? Rubber Baby Buggy Bumper??
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Old 10-23-2015, 10:49 AM   #45
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Proper failure analysis

rmkrum with his suggestion of "it looks like air leaked between
layers of the tire, as a guess a manufacturing defect or
weird damage.
" Is definitely on the right track. But we need a bit more information/inspection to narrow things down to discover the real "Root Cause".
"Root Cause" is the initiating action or condition that leads or develops into the the current condition. For example if a tire looses air there are a number of possible causes. One might be a leaking valve, but why is the valve leaking? Is it because the valve was damaged or defective or installed incorrectly? If it was because it was installed incorrectly we could ask "Why" again and maybe discover the improper install was because of poor training or incorrect tools or the technician was rushed and distracted while doing the install.
It may be that one tech started the valve install and was called away and a second tech thought the install had been completed and went ahead and mounted the tire.
I think if you consider the above example you can see that learning the real reason for the condition is needed if we want to prevent a re-occurrence.
Simply jumping to the conclusion that the tire failed because it was made in tire plant that was painted blue is not really helping us to learn.

I do not agree with the various posts on "old tire"

CapriRacer is suggesting further inspection But I don't agree with following his exact inspection method as there is a potential of destroying the evidence if the cut is done in the wrong location.

As I understand it, this tire is a number of years old so "Manufacturing Defect" is less likely as those issues should normally show up in first couple of months use.


Further examination is needed to collect more physical evidence, if we want to move away from guesses what should be done is to deflate the tire and dismount it from the wheel.
Visual inspection of the interior with good lighting is the next step.

Depending on what we see will dictate if further examination and dissection is needed or not.

Before any cuts are made it is important that a theory is established so an appropriate action is planned out.

I have some examples (photos) on my other PC and will post examples later today that will allow us all to learn the real Root Cause. Until then I would request that the tire not be cut.
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Old 10-23-2015, 11:25 AM   #46
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Quote:
Originally Posted by Lumatic View Post
Sidewall separation from running flat, low pressure or impact with a curb?

Could also be an implanted alien baby.
I vote for alien baby too!
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Old 10-23-2015, 11:38 AM   #47
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Too many left turns. This puts extreme pressure on the plys on the right side of the tire. Or, was it right turns...Making turns cause all sorts of trouble.

That's my story and I am sticking to it.
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Old 10-23-2015, 01:33 PM   #48
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Quote:
Originally Posted by Tireman9 View Post
rmkrum with his suggestion of "it looks like air leaked between
layers of the tire, as a guess a manufacturing defect or
weird damage.
" Is definitely on the right track. But we need a bit more information/inspection to narrow things down to discover the real "Root Cause".
"Root Cause" is the initiating action or condition that leads or develops into the the current condition. For example if a tire looses air there are a number of possible causes. One might be a leaking valve, but why is the valve leaking? Is it because the valve was damaged or defective or installed incorrectly? If it was because it was installed incorrectly we could ask "Why" again and maybe discover the improper install was because of poor training or incorrect tools or the technician was rushed and distracted while doing the install.
It may be that one tech started the valve install and was called away and a second tech thought the install had been completed and went ahead and mounted the tire.
I think if you consider the above example you can see that learning the real reason for the condition is needed if we want to prevent a re-occurrence.
Simply jumping to the conclusion that the tire failed because it was made in tire plant that was painted blue is not really helping us to learn.

I do not agree with the various posts on "old tire"

CapriRacer is suggesting further inspection But I don't agree with following his exact inspection method as there is a potential of destroying the evidence if the cut is done in the wrong location.

As I understand it, this tire is a number of years old so "Manufacturing Defect" is less likely as those issues should normally show up in first couple of months use.


Further examination is needed to collect more physical evidence, if we want to move away from guesses what should be done is to deflate the tire and dismount it from the wheel.
Visual inspection of the interior with good lighting is the next step.

Depending on what we see will dictate if further examination and dissection is needed or not.

Before any cuts are made it is important that a theory is established so an appropriate action is planned out.

I have some examples (photos) on my other PC and will post examples later today that will allow us all to learn the real Root Cause. Until then I would request that the tire not be cut.

Yes, root cause is a cheaply built junk tire that is marketed well and sold at a high profit. You get the same sales pitch from every employee at every tire store. It is a good concept and a good principle in theory or on paper that does not translate well into reality.


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Old 10-23-2015, 03:25 PM   #49
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OK since I can't post links to my blog and have to upload individual pictures to a photo hosting site it is a pain to have too many pictures but here are three from one tire.

Background. Tire and wheel sent in for analysis with request for information on what was wrong with the "defective" new tire.
Picture 1

Here we see a smaller version of the sidewall bubble.

Picture 2

same tire but on the inner sidewall

Picture 3

this shows the interior of the tire at the location of the bilge.

If you review Picture 1 and Picture 2 you can see the witness mark where the tire sidewall was deflected down to the point that it left a black mark on the top of the wheel flange.
You might also note that the impact (in the pothole ?) was bad enough that both inner and outer rim flanges were bent during the impact.

Di you believe the country or state of origin where this tire was made was the reason for the sidewall bubble or do you accept that it is possible to fail any tire under the correct set of circumstances?
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Old 10-23-2015, 05:00 PM   #50
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None of our Marathons are on a bent wheel that hit a pothole-


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Old 10-24-2015, 11:15 AM   #51
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Quote:
Originally Posted by m.hony View Post
None of our Marathons are on a bent wheel that hit a pothole-


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You don't need to hit something hard enough to bend a wheel to have an "Impact break" in the tire sidewall.

Here is a tire that had a smaller but similar SW blister. You can see the broken body cord. No bent wheel either.



It sure would be nice if I didn't have to provide evidence whenever I offer technical information based on 40 years as a tire design engineer.
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Old 10-24-2015, 11:51 AM   #52
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Thank you Tireman. It today's Fox News world hype out trumps fact and it is often difficult for many to separate fiction from reality.

I appreciate your calm experienced based posts.
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Old 10-24-2015, 11:52 AM   #53
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Here are my observations, the vast majority of tire failures are a result of under inflation or road hazards, but some tires are crap from the get go.

The hard part is being able to;

A. See the difference

B. Admit the difference

I have no experience whatsoever with Goodyear Marathons, so I have to infer an opinion, weighing that as OEM tires on most Airstreams, they have a lot of exposure to negative comments.

My opinion is that the tires are not as rugged as they should be, but they are maybe as good as other ST tires.

I am in fact (heavily) biased toward LT tires, but unlike the majority of posters in this category I am content with 15" wheels.


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Old 10-24-2015, 12:45 PM   #54
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Carlisles and Marathons are junk from the get go.
Properly inflated, rotated, balanced, Armor-all'ed to protect from UV rays. never hit a curb or pothole and still won't last 3-4 years.
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Old 10-24-2015, 01:05 PM   #55
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Against my better judgement I allowed my local tire shop to talk me into ST tires for my Airstreams first set of tires.

I don't remember the brand, they didn't blow out but the tread was all but worn out in about 12K to 15K miles and two years.

I was NOT IMPRESSED.


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Old 11-28-2015, 10:58 PM   #56
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I bet they are made in China. Life is short and trailer repairs are expensive, so don't waste your hard earned money on Goodyear tires.
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