As explained by Bridgestone, the tire’s tread provides the traction needed for a vehicle to travel safely down the road. The tire’s tread wears down a little more with each mile driven until they have minimal or no tread left. At this point, they are bald tires. When they become bald, there is an increased risk of potentially dangerous issues such as: Blowouts caused by the increased heat created through friction between the road surface and the tires. Without tread, this heat increases, weakening the tire material. Blowouts or flats resulting from punctures. The tread provides traction on the roadway and protects the tire's integrity from sharp objects such as rocks or nails. Tires with minimal or no tread do not offer this protection. Hydroplaning due to the lack of tread and the inability of the tires to grip wet roads. This lack of tread can also result in the car sliding on gravel or requiring a further stopping distance after the driver has braked.