They stabilize the tread elements and prevent them from shifting. As the tread area is stabilized, the tire's tread wear is even throughout its lifetime. The longer lasting, even wear allows the tire to be used for an extended time. The internal structure also increases the tire's durability. The steel belts prevent the tire from deforming under the driving pressure, which improves the tire's performing capability. As the tire does not deform under the driving pressure, it is capable of performing to its highest ability.