What is the outer layer of rubber on a tire called?

The outer layer of rubber on a tire is known as the tread. This component is crucial because it provides the tire with traction, allowing the vehicle to grip the road surface effectively. The tread design, including its patterns and grooves, plays a significant role in channeling water away from the tire during wet conditions, thus helping to prevent hydroplaning.

In addition to traction, the tread also affects the tire's performance characteristics, such as handling, stability, and wear. It is the part of the tire that comes into direct contact with the road, making it essential for driving safety and efficiency. The tread's design varies depending on the type of tire and its intended use, whether it be for cars, trucks, or specialized vehicles.

Knowing the function of the tread is important for understanding overall tire maintenance and safety, as well as for recognizing when a tire may need to be replaced due to tread wear.