Prepare for gritty riding with the Continental Ultra Gatorskin Folding Tire. Made for rougher road conditions, these tires are heavier duty than the Grand Prix line with extra puncture protection. They feature DuraSkin, a nylon mesh layer that enhances the sidewall to protect against cuts and abrasions while maintaining a smooth ride and a superfine 170 TPI casing to give lightness and suppleness on the road, even in rougher conditions. The Continental Ultra Gatorskin Tire is a Kevlar beaded folding tire. It is available in sizes 700c x 23mm and 700c x 25mm. If you are after a more supple ride quality the 25mm offering will do just that.