Originally Posted by r carl
1. Many many people that went up a load range on ST tires had them fail for no reason.....
Over my carreer I estimate I was involved in 20,000+ tire "autopsies" and for the last 10 years or so of my job my primary duty was failed tire inspection where I was the last person to get involved when others could not identify the Root Cause reason for a failure.
I had to issue written reports that were sent to engineers at GM, Ford, Chrysler, Honda, Toyota, BMW, Porsche etc so simply providing "customer satisfaction" and giving them a replacement tire was not an option. They wanted proof.
My inspections involved not just visual inspection but sometimes X-Ray, Holography, drum testing, chemistry and even Electron Microscope were tools involved.
I believe that in over 98% of the cases we were able to present physical evidence that supported the theory of why a given failure occurred so to me, "no reason" simply means that the person doing the inspection did not have the training or tools available to learn the real reason for a specific failure.
I am providing this information in an effort to demonstrate that failed tire analysis is not a simple task but takes decades of experience and access to numerous tools so a fact based conclusion can be reached.
I do not believe in Magic but in Science and physical evidence. The overwelming reason for tire failure is loss of proper inflation pressure with punctures, cuts, valve leaks and other forms of damage being the reason for the air loss.