Maybe everybody on here knew this but me, but I learned interesting facts about tires I did not know from a news story tonight. a) It is common for tire stores to sell old tires that have been sitting on the shelf for as much as a DECADE. Tires can begin to degrade at six years even with no use! b) If your tire has been recalled, you WILL MOST LIKELY NOT EVER BE CONTACTED BY ANYONE!!! c) FIVE HUNDRED PEOPLE DIE EACH YEAR due to tire failure related accidents, some of whom are driving on OLD TIRES that fail or tires that have been recalled! To be notified if your tires are ever recalled, you must register your tires with the manufacturer when you buy them! The tire store does not do this!!! (I had always assumed they would let me know in case of a recall) To know when a tire was manufactured, you can read the code on the tire that tells the WEEK and the YEAR. My new Model S tires were made in the 12th week of 2015. Be safe out there!