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! The Plus version offers even greater puncture safety and stability; this is made possible by a ProTite insert in the side wall and a circumferential nylon protective belt. Made in Japan - this is what distinguishes this and over 90% of the other Panaracer tire assortments. This ensures outstanding manufacturing quality using the most advanced materials.