- ----- Original Message -----
From: Henry Davis
To:
Sent: Sunday, November 14, 1999 3:38 AM
Subject: Re: GMC: Sidewall flex, intermediate axle/rear axle
>
> Because of several questions that I have about my own tires, I've been
> talking with Goodyear's Chief Engineer for materials, the QA engineer for
> light truck tires, and the North Western regional manager.
>
Hello Henry,
So have I been talking to GY engineers. The info I got don't agree with
what they told you. The statement that underinflation is the cause of
failure is not correct either. They, after several weeks told me they were
very familiar with the GMC and the answer was overloading tires. In general,
what they told you was self serving (to them) and lacks credibility. Also,
there are a lot of tire failures do to manufacturing defects, the number is
not vanishingly small. Tires are not micro-chips. I had access to test
data for tires in the past and there were tire brands and tire lines that
had huge failure rates in relation to others. One of the biggest factors
that the data I had showed was that the manufacturing process was an
important factor to predict reliability and durability. Since manufacturing
techniques have not changed significantly since my data was current, I doubt
that much has changed there. Did you discuss with the Goodyear folk tire
manufacturing techniques? If not, you will find there is a dividing line
between the all steel and the rest of the tires we use (Load D & non-steel
E). The all steel use a technique that places the body plies more
accurately, which should give them more strength and fewer manufacturing
defects that can cause problems. Could this be another reason why all steel
are better? I think its an important part of the puzzle. walter bright, 76
GB
From: Henry Davis
To:
Sent: Sunday, November 14, 1999 3:38 AM
Subject: Re: GMC: Sidewall flex, intermediate axle/rear axle
>
> Because of several questions that I have about my own tires, I've been
> talking with Goodyear's Chief Engineer for materials, the QA engineer for
> light truck tires, and the North Western regional manager.
>
Hello Henry,
So have I been talking to GY engineers. The info I got don't agree with
what they told you. The statement that underinflation is the cause of
failure is not correct either. They, after several weeks told me they were
very familiar with the GMC and the answer was overloading tires. In general,
what they told you was self serving (to them) and lacks credibility. Also,
there are a lot of tire failures do to manufacturing defects, the number is
not vanishingly small. Tires are not micro-chips. I had access to test
data for tires in the past and there were tire brands and tire lines that
had huge failure rates in relation to others. One of the biggest factors
that the data I had showed was that the manufacturing process was an
important factor to predict reliability and durability. Since manufacturing
techniques have not changed significantly since my data was current, I doubt
that much has changed there. Did you discuss with the Goodyear folk tire
manufacturing techniques? If not, you will find there is a dividing line
between the all steel and the rest of the tires we use (Load D & non-steel
E). The all steel use a technique that places the body plies more
accurately, which should give them more strength and fewer manufacturing
defects that can cause problems. Could this be another reason why all steel
are better? I think its an important part of the puzzle. walter bright, 76
GB
wner-gmcmotorhome]On Behalf
