Kumho Ecsta ASX Radial Tire - 235/55R17 99Z SL Asymmetrical tread design optimizes all-season performance. High-tech silica compound delivers the optimum balance of wet and snow traction, treadwear and fuel efficiency. Large outside blocks maximize cornering performance. High-angle slant and circumferential grooves provide optimum water drainage to resist hydroplaning. E-technology step grooves and sipes increase edge effect for increased wet and snow performance.