Ideal for gravel, dirt, and rough payment Available in Black Tread and Black or Brown Wall Colors Folding (Aramid) Bead Available in 700 C, 26, and 27.5 Sizes and a variety of widths TLC and Hookless Compatible in widths 32mm and larger Looking for a tire that's more aggressive than the mixte-tread GravelKing? The GravelKing SK might just be the tire you need for the more hardcore roads. Aggressive knobs, ZSG Natural rubber compound, puncture protection breaker and AX- special low rolling resistance casing make the Gravelking a go-anywhere tire. And tubeless compatible up to 60 PSI!