Panaracer GravelKing R Tire - 700 x 45 Tubeless Folding Black/AmberPanaracer GravelKing R Tire 700 x 45 Tubeless Folding Black Amber. The GravelKing R tire utilizes all new casing technology making it the fastest and most supple Gravelking tires to date. Ideal for gravel dirt and rough pavement TuffTex R provides bead to bead protection that represents Panaracers most supple and lightweight casing to date. This distinctive combination guarantees an exceptionally smooth ride providing the lowest rolling resistance