Construction of tires. The main purpose of the tires is to protect the mechanisms of the car and passengers from shocks while driving on uneven roads and to ensure smooth rolling of the wheels.. The tires consist of a tire and an inner tube. Tubeless tires are also used. Due to this, that the tire transfers the driving force from the hub and disc to the road surface, must have proper adhesion, necessary when braking and driving in various road conditions. The tire tread is made of hard, abrasion-resistant rubber, it has longitudinal and transverse grooves, which increases the tyre's grip on the road surface. Tire carcass, made of several or several layers of cord fabric vulcanized in rubber, it is the inner part of the tire (the matrix can also be made of plastics). The carcass of the tire passes into the so-called. tire bead, in which there is a bunch of steel wires, that ensure proper adhesion of the tire bead to the rim flange. Tire, with broken or broken bead wires, it is not suitable for further use, nor to be repaired. The strength of the tire depends on the number of layers of the cord fabric. In low pressure tires, commonly used in motor vehicles, the number of layers of cord fabric is reduced (3—6), while in high-pressure tires, used in certain types of buses and trucks, the number of layers of cord fabric comes to 10, and even more.