245/45R18 100H XL TL BSW NS-II ULTRA SPORT NANKANG Two center circumferential grooves design can efficiently direct water away and enhance superior wet handling. Computer designed V-shaped drainage sub-grooves increase resistance to hydroplaning in high speed running. Two-in-one pitches and variable width tread design can reduce rolling noise and promote a quieter comfort ride. Shoulder edge sipes design promotes even and long treadwear.