"Tread depth is irrelevant as tire wear rate is far more important along with the fact you will never wear them out within the time they naturally expire."
Cummins12v98,
Thank you for the feedback. Curious as to what you base the "irrelevant" statement on? The 10 tires manufacturers specs I looked at, maybe 10 specs per tire, all list "Tread Depth". None have a spec about wear rate although I would like to see that quantified. Possibly there are too many variables involved to make it a metric: tire pressure, load, speed, weather, surface driven on, etc.