What is the force that has caused the tires to wear out?

The primary force causing tires to wear out is friction, which occurs between the tire surface and the road during driving. This friction generates heat and leads to the degradation of the tire material over time. Additionally, factors such as improper alignment, inadequate tire pressure, and aggressive driving can exacerbate wear by increasing the intensity of this friction. Ultimately, the combination of these forces contributes to the gradual loss of tread and overall tire performance.