CapriRacer wrote:
Clustered failures is just the way durability failures work. It doesn't mean that the tires are bad or the tires are over-loaded. It means that's just the way failures occur.
For example, if I take a bolt and pull it until breaks - then do that for 100 different bolts - I will get a cluster around a certain value.
If I change the bolt to a stronger material (like going from a grade 5 to a grade 8), the test results would be higher but still clustered.
So when a person experiences multiple tire failures many years after installing them (with no incidences before that), all it means is that the tires are reaching their durability limit. This could be because the tires are overloaded (or under-inflated) or it could mean the tires don't have very good durability. You can't tell which it is without additional information.
I understand what you are saying, but statistical values are generally based and require a large sample size, upwards of 100 or more for a normal distribution to be meaningful/useful. So in this case with the tires only be less than 3 years old and just over 2 years of in service use I don't think your example explains what happended. The OP didn't specify which tires by location failed and in what order and it would be interesting to see if what I described as a possibility might have been the cause of the multiple failures so close together.
Larry