Glossary

Void ratio

Last reviewed: 2026-05-20

The proportion of the tread face that is open groove or void space compared with rubber contact area. Higher void ratios can improve water evacuation, mud or snow traction, and biting edges. Lower void ratios put more rubber on the road, which can improve wear stability and rolling efficiency in highway service.

Highway rib tires usually have lower void ratios for steady wear and fuel efficiency. Lug-pattern drive tires use higher void ratios for traction but may be more prone to heel-toe or block movement if used in the wrong service. Match void ratio to route, weather, and axle position.

Real-World Use

A fleet manager specifying tires for a rain-heavy regional route considers void ratio alongside load rating, tread depth, and expected mileage. A very open lug pattern offers traction, but the fleet avoids it on a trailer position where scrub wear is already a known issue.

Reference Sources

Sources used for context and verification of regulatory thresholds, inspection criteria, and compliance references on this page.

Editorial TruckTireGuide.com editorial notes (TruckTireGuide.com, reviewed 2026-05-20)

What to Pair It With

Read this term with the full tire sidewall, vehicle rating information, manufacturer documentation, and the actual condition of the tire.

This site is for general information only. It does not replace professional tire service, DOT compliance advice, tire manufacturer instructions, vehicle manufacturer recommendations, or fleet policy.