Yes, they do, and you're not the only one to have that particular misfortune. When I was about ten years old, we had a family vacation get off to a very bad start due to an apparently bad batch of tires that Dad had bought the week before. (Seemed like a good idea at the time, of course -- two-week trip coming up, tires are getting old, looks like a good time for new ones, right?) We had a tread separation and blowout... stopped and changed the tire, and continued down the highway, hoping to find a dealer in the next city who would replace the bad tire under warranty. Got about three miles down the road, and BANG! there went another one. No spare this time, of course. :-( Thank goodness for AAA.