Most likely your tires are new as the ones that are on mine are. However I saw a date line show about how some tires that people think are new are really not. They may be new in the sense of never having been run on a car, but they may have been sitting on the shelf for years. After sitting for years the rubber starts to degrade and can fall apart. There is a code that you can find on your tire to find out when the tire was made. The code on my xb tires and the new ones I bought is both 0208. That means they were made the second week of 2008. So check for your code. The first 2 letters is the week. Should be 01-52. The second number is the year. If its 1-9 it was made in the 90's. If its 00-08 its in the 2000's.