For my wife and I, the tires are usually pretty near being wore out as they get neat that 6 year old mark. Replacing them just before the next winter is always a good plan, we get snow here that our daily drivers will see. We have 3 vehicles, I have things set up that we usually only have to buy 1 set of tires any given year, and hopefully that only happens about every other year. Working pretty well so far.