Challenge Grifo TLR Tire 700x33C Folding Tubeless Ready Vulcanized Nylon BlackThe best all around cyclocross tire ever created excels in wet or dry, soft packed, rocky and root infested courses, grass, and more The Grifo features fast rolling knobs and a center section that offers excellent pedaling and braking traction This TLR clincher with 120TPI nylon casing provides both performance, durability, and puncture protection when combined with the appropriate tubeless sealant. UCI legal 33mm casing when mounted to 15 19mm