The D.O.T. approved Nitto NT555RII radial tires for auto cross competitions and road races feature a unique fusion of the Nitto Drag Radial tread pattern and stiff sidewall for racing. Their tread design includes twin center ribs that provide consistent surface contact at all times and enhances stability. Large tread blocks provide optimal surface contact for better cornering and traction. The soft racing tread compound enhances control and handling even in extreme racing conditions.