There's no denying that experiencing a great tubular tire is a wonderful experience. You won't believe that your bike could be so smooth and fast. So if you're going to make the switch to tubulars, do yourself a favor and wrap some Challenge Strada Tubular Tires around your hoops, because Challenge simply does it right. For the casing of the Strada, Challenge used its handmade, highly puncture resistant, and lightweight SuperPoly material. With its 300 threads per inch TPI, you receive a remarkably supple ride that you'll feel the first time out. On top of the casing, Challenge added a belt of corespun polyester, made by twisting fibers around a central filament core, creating one yarn from multiple strands. As a result, the material is between 40 and 50% stronger than typically spun materials, while retaining a similar, if not lower, overall weight. This layer is what Challenge calls its PPS Puncture Protection System, and it's specifically made from the tightly woven polyester material to preserve the casing's supple feel. The 25mm wide profile was then wrapped with the popular Paris Roubaix herringbone tread pattern, a design that continues to be one of Challenge's most versatile for a variety of road surfaces. This low profile pattern perfectly blends speed and grip. The tread was applied using Challenge's proven hand glued methods, which involves mounting and then inflating the casing on a wheel. Only then does Challenge carefully glue on the tread layer. As a result, the tread isn't put under tension when you inflate the tire on your wheel, and that lack of tension leads to lower rolling resistance, added grip, and increased comfort. The Challenge Strada Tubular Tire weighs approximately 285 grams each, comes in the colors Blackblack and Blacktan, and in the 700c x 25mm size.