Ride how and where you want The right tire when it comes to tough conditions. The right choice for a strong performance in the urban field and on tour. Handmade for You. PolyX Breaker With PolyX Breaker car expertise comes to the bicycle tire sector. Polyester has been used successfully for years in car tires and has proved extremely effective. The extremely resistant polyester fibre is woven tightly crosswise. A very high fabric density is achieved which makes the breaker resistant not only to foreign bodies, but especially to punctures. The rolling resistance is not affected by this breaker. Dura Skin Tires with DuraSkin sidewall protection have to be able to roll with the punches. They are used under the harshest conditions. On messenger bikes, the tires skid along curbs; on touring bikes, they cross continents without wearing out. In racing cycling, they have to endure tough tests such as the Paris-Roubaix. The high-quality polyamide fabric protects the tire casing against the worst conditions. These tires stand out thanks to their brown sidewalls.