Nitto NT555 - By utilizing a racing concept design, Nitto Tires engineers developed the NT-555 Extreme ZR. With a specially formulated compound and one of the biggest contact patches available, the NT-555 provides superior traction, reliable handling, and delivers total vehicle control. The three-circumferential grooves channel water efficiently, while the lateral grooves break up the water wedge. This combination of grooves and channels reduces the chance of hydroplaning.