GravelKing SK+ has a semi-knobby tread pattern with a super tough puncture belt for aggressive Gravel roads. GravelKing SK+ has side reinforcement with Protite and bead-to-bead nylon puncture belt, resulting in a 4ply, super tough casing. Specs: Flat ProtectionTread and Sidewall Labeled Size700 x 50 ISO Diameter622 / road / 29" Tire BeadFolding Tire TypeTubeless Ready Clincher ColorBlack Defined ColorBlack Tire Intended UseGravel ISO Width (mm)50mm Tire Diameter700c