Looking for a tire that's more aggressive than the mixte-tread GravelKing?<p> The GravelKing Sk might just be the tire you need for the more hardcore roads. </p><p>Aggressive knobs, ZSG Natural rubber compound, puncture protection breaker and AX-α special low rolling resistance casing make the Gravelking a go-anywhere tire. </p><p>And tubeless compatible up to 60 PSI!</p>