Glossary
Void ratio
The proportion of the tread face that is open groove space versus rubber. Higher void ratios improve wet traction and drainage; lower void ratios provide more rubber contact for wear resistance and fuel efficiency.
Highway rib tires have low void ratios for fuel efficiency and even wear. Drive lug tires have higher void ratios for traction in adverse conditions.
Real-World Use
A fleet manager specifying tires for a rain-heavy regional route considers void ratio alongside load rating when comparing tread patterns for trailer positions.
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.