Panaracer GravelKing SK Tire - 650b x 43 / 27.5 x 1.75 Tubeless Folding BLKPanaracer GravelKing SK Tire 650b x 43 27. 5 x 1. 75 Tubeless Folding Black. The Gravelking SK maintains its position as the benchmark against which all gravel tires are measured. Ideal for gravel dirt and rough pavement TuffTex boasts a supple high thread count casing fortified with precisely engineered bead to bead puncture protection BeadLock is engineered to accommodate a broader range of rims including both hookless and clincher types. In most