Redesigned for the gravel roads we ride, the Gravelking SK has the same semi-knob tread we loved in the original with a more robust casing to protect against flats. The Gravelking has Panaracer's Zero Slip Grip rubber compound for superior traction when we need it, with a fast-rolling center tread to carry speed on smooth sections. More aggressive lugs on the outside of the tire help us corner with confidence through loose terrain, washboard, or singletrack. Panaracer's ProTite Shield Plus casing adds the layer of protection we need for our tires to float on past the road hazards that would otherwise cause a flat and off to the next horizon.