Hankook Optimo H426 All-Season Tire - 235/55R18  100H Solid center rib aids in light handling responsiveness, comfort and rolling feel High angle diagonal grooves channel water from the center Interlocking solid shoulder rib maintains flexibility for traction, yet stable for handling and resistance to irregular wear Long interlocking intermediate buttons provide stability for improved stopping distance prrformance High kerf denity across tread adds cutting edges for winter