How long should tires last before they dry rot?

Michelin tires often come with a pretty good warranty, but it may not extend to the next owner, or at least may not if you do not have the paperwork that goes with them. I'd say that it's worth checking. That said, here's some good info on tires and aging...

http://www.edmunds.com/car-care/how-old-and-dangerous-are-your-tires.html

- R