what causes tires to dry rot
Dry rot is considered to have occurred on a tire when cracks begin to emerge on the tire's rubber. The rubber is what holds the tire together. However, whether the dry rot is dangerous is determined by whether you can see the tire's cords. The cords are what cause the tire to resist inflation pressure. If the cords begin to deteriorate--in other words, if the cracks reach the cords--the vehicle is dangerous to drive on.