Glossary “tread rubber” Definition:
A blend of up to 30 different synthetic, and eight natural rubbers used in a tire tread.

Glossary “tread wear indicator” Definition:
Projections of rubber, 1/16 inch (1.59 mm) high at the bottom of the tread grooves, spaced around the tire to identify a tire worn to the recommended safe limit.

Glossary “tread wear rating” Definition:
Tire rating indicating the wear capabilities of the tread that allow consumers to compare tire life expectancy.

Glossary “tread rib” Definition:
Raised portion of the tire tread between the grooves.

Glossary “tread distortion” Definition:
Tread shape change on certain tires as rotating contact is made with the road surface; less severe in belted tires.

Glossary “tread groove” Definition:
Recessed portion of the tire tread between the ribs.

Glossary “tread compound” Definition:
Blend of synthetic rubber used in the tire tread material.

Glossary “tread depth gauge” Definition:
Instrument that will quickly measure tire wear at the tread.