The Challenge Grifo is the best all-round cyclocross tyre ever. Period. Designed to excel in wet or dry conditions, soft, packed, rocky or rooty it can handle it all. Not only does it have all the grip you ll ever need, but it also rolls quickly to boot. Look up all-rounder and you ll see the Challenge Grifo.  Highly versatile tread pattern excels in all conditions  Vulcanised Race casing gives an incredibly smooth and supple ride   Folding bead casing Race rubber compound for excellent grip and durability   Not tubeless compatible  The Grifo features a fast-rolling centre section, but it is the shape and formation of the rest of the tread that gives it the edge over the competition. The staggered and aggressive excel in all terrains and conditions, while Smart rubber compound is both grippy and highly durable.On rough gravel trails, you need confidence that your tyres are tough enough for the job and the Grifo won't let you down thanks with the vulcanised Race casing gives it that ele