310T Truck And Coach Technician Certification Practice Exam

Concentrated tread wear in the center of a steering tire is primarily caused by over-inflation. When a tire is over-inflated, it alters the shape of the tire and increases the contact area at the center of the tread. This results in more wear occurring along the center line, as that portion of the tire is making more contact with the road surface while the edges remain less engaged. In contrast, under-inflation typically leads to wear on the outside edges of the tire because the tire bulges outward. Excessive toe-in can cause uneven wear across the tire's surface but generally does not result in center tread wear specifically. Excessive caster affects the stability and handling characteristics of the vehicle but does not directly lead to concentrated wear on the tread of the tire in the manner over-inflation does. Thus, recognizing the relationship between tire pressure and tread wear patterns is essential for maintaining proper tire health and ensuring safety on the road.