Attention United States drivers: Your tires can be a lethal hazard waiting to happen, even if you just bought them "new" at the store. The key isn't how long they've been used or not used, but how long ago the tire was made. Tires over 15 years old are still being sold as new in auto centers across the country, accidents waiting to happen. Here's an ABC News video about old but unused tires being sold as new, and what the hazard is: Aged Tires: A Driving Hazard?
For some reason, the same companies that issue "strongly worded" warnings abroad about old tires don't think they're necessary in the US, and are lobbying against them.