Panaracer Gravelking Sk 700x50c BROWNReinforced 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 Panaracers Zero Slip Grip rubber compound for superior traction, with a fast rolling center tread to carry speed on smooth sections. More aggressive lugs on the outside of the tire ensure confidence through loose terrain, corrugations, or singletrack. PRODUCT