The Challenge Gravel Grinder is perfect for adventure and gravel riders who want more control than the Strada Bianca for rougher, looser gravel roads and trails.File tread pattern with exaggerated side tread for excellent speed and gripVulcanised Race casing gives an incredibly smooth and supple rideFolding bead casing with PPS puncture protectionRace rubber compound for excellent grip and durabilityNot tubeless compatibleThe Gravel Grinder's file centre tread gives it incredibly low rolling resistance, so you can speed along without giving too much away to the much slicker Strada Bianca. Compared to the Strada Bianca though, the Gravel Grinder's exaggerated side tread gives bundles of confidence in loose corners, so you can attack them.On rough gravel trails, you need confidence that your tyres are tough enough for the job and the Gravel Grinder won't let you down thanks to it's double PPS puncture protection, while the vulcanised Race casing gives it that elegantly supple ride that m