Kumho Ecsta SPT KU31 High Performance Tire - 215/40R18  89Z High dispersion silica expands compound performance for superior wet grip and better treadwear Jointless cap plies, wide steel belts, ESCOT carcass profile, and high durometer apex Shoulder blocks tilted into direction of travel to improve grip and reduce worn-tire noise Three wide circumferential grooves optimize water evacuation in footprint Rim protector in lower sidewall safeguards wheel against scratches and abrasions