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-α special low rolling resistance casing make the Gravelking a go-anywhere tire. And tubeless compatible up to 60 PSI! Weight: 420 g Max PSI (tubes): 75 psi Max PSI (tubeless): 60 psi Protection: Anti-Flat Casing Size: 700 x 38mm