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Old 08-09-2013, 11:06 AM   #1
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Tire Information

Got this information from another forum. There's a lot of information here that is essential for all who rely on their tires to carry them safely down the road. Not all of his web sights showed up when I pasted and copied but they may be available on his web sight.

Tire Problems? Some Facts from a Tire Engineer
I haven't been as active on Heartland as I would like but I have a dozen forums to monitor and of course my blog, plus I do have other interests. But I felt I might help owners have a better understanding of tires and tire problems with this summary

First off there is a lot of confusion about tire failures. Incorrect terminology makes it harder or even impossible to properly diagnose the reason for a failure. I think you can understand that if you run over a screw or nail there is a good chance you will leak air which can ultimately lead to a Run Low Flex failure (most call this a Blowout). Any tire can get a puncture so blaming the tire is of no value.

You can also have a leaking valve or an actual failure of the valve body itself which again leads to air loss followed by Run Low Flex failure

You might have a detachment of the tread and/or belts from the body. In this cast the tire may even retain all its air. The cause for this can be excess heat or age has caused a loss in flexibility and strength of the belt rubber.

Finally there may have been a problem during manufacturing. In this case we usually see a batch (100 to 100,000) tires that might have a failure. Usually there is a recall.

Run Low Flex failures can be almost completely eliminated if you run a TPMS. While checking the air each morning is good thing to do, it does nothing to warn you that you have a leaking valve or a cut or puncture. It only takes a few miles at very low pressure to flex the sidewall to the point the body ply melts.
and and are examples of Run Low Flex failures

Here is what melted body cord can look like or

These conditions are physical proof the tire was run miles at significant underinglation and highway speed.

A Tread detachment results from weakening of the belt rubber. If the wrong rubber was used in manufacturing( defect) the tire would most likely fail at very low mileage. A much more likely cause is accelerated aging of the belt rubber. This occurs when the tire is overheated. The aging rate of rubber doubles with every 18F increase in temperature so parking with the tire in full sun and not under a white cover can accelerate the aging ( loss of strength) to 4 times as the test I wrote about in this post shows a 36F increase in tire temperature because of no cover.

Another cause of increased belt rubber temperature comes from higher speed and certainly increase heat comes from higher loading. These affects are additive.

Finally we need to remember that damage (aging) to the rubber is cumulative and cannot be reversed. Once you run your tire underinflated putting air back in the tire does not repair the damage already done. The heat/time affects are cumulative and every hour/day week spent at elevated temperature causes the belt rubber to loose its elasticity which can lead to tearing and ultimately to a belt/tread separation.

I have over 100 blog posts and I am sure there is a lot of information that you might find of value, so take a look if you have more questions.
I have my email posted on the blog under my picture and will answer questions. I do ask you provide the complete tire size information including Load Range and your tire loading will certainly help.


Started by TeJay
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Old 08-12-2013, 11:31 AM   #2
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This information may have been posted many times, but never too much IMO. The Rubber Manufacturers Association states over 90% of all tire failures are the result of overloading/underinflation, which directly correlates to the article you posted, Thanks for repeating this information!
2000 Winnebago Ultimate Freedom USQ40JD, ISC 8.3 Cummins 350, Spartan MM Chassis. USA IN 1SG 11B5MX,Infantry retired;Good Sam Life member,FMCA." My fellow Americans, ask not what your country can do for you, ask what you can do for your country. John F. Kennedy
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Old 08-12-2013, 11:37 AM   #3
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Great information and thanks. My Dad taught me over 40 years ago to make sure to check tire for wear and inflation before each trip. Except for those cases where you run over something that improper maintenance is the biggest cause of failure.
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Old 08-12-2013, 12:26 PM   #4
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Thanks for the compliment. If people think the information is of value they can save themselves some work by subscribing after they read the existing 100+ posts. I only post about 3 times a month with no firm schedule so a subscription means you don't have to be going back to see if I have written anything new.
Retired Design & Quality Tire Eng. 40+ years experience. Recognized in the industry and in court as an expert in failed tire inspection as I have performed thousands of failed tire "autopsies".
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