It’s not clear to me reading material about tread wear depth how tread wear pattern may affect tire replacement.
It generally states to replace when the wear indicators are exposed (flush with tread) or when less than 2/32" with the penny test. But is that applicable for when any one of the tread grooves meet that criteria or when all the grooves meet that criteria?
Say for example I have some car alignment problem etc. and one side of tires are nearly worn but the other 2/3 (middle and other side) of tire is still good. That seems a bit wasteful if have to replace under that circumstance.
Also, if the set of tires were bought new and reached this (one sided) wear state before the full/max tire life rating (mileage/year), would the prorated discount generally apply or not (because they’ll just say your car has problems that wore out the tires)?