Which tire component is referred to by the term tread?

• A. The sidewall
• B. The tread
• C. The bead
• D. The carcass

Answer: (B)

Tread refers to the outer rubber surface of the tire that makes contact with the road and provides traction. This part has the patterns and grooves that grip the road and channel water away to maintain grip, especially in wet conditions. As the tire wears, tread depth decreases, reducing traction and increasing stopping distances.

The other components are different parts: the sidewall is the rubber area that runs along the side from the rim to the tread; the bead is the reinforced edge that seats the tire onto the wheel rim; and the carcass is the internal structure of fabric and cords that gives the tire its shape and strength. So the term tread specifically describes that outer, patterned surface responsible for grip.