Kumho Road Venture APT KL51 Radial Tire - 255/55R18 109V Solid center rib provides steering response and delivers a comfortable ride. Four wide circumferential grooves supported by lateral grooves and interlocking sipes improve response to hydroplaning. Wide tread blocks with interlocking sipes deliver steering stability and long, even wear. Optimized tapered tread grooves promote self-cleaning for improved wet and snow evacuation.