Challenge's Almanzo is a wide-profile, versatile, multi-surface tire that excels when the road is less than perfect. It's great on dirt and in situations where you just don't know what the next mile will throw at you. The center tread rolls fast, while the shoulder knobs corner great. It's hand made on Challenge's supple and light 260tpi SuperPoly casing with double puncture protection, a durable tread compound that sticks to the road in the corners, and tough polyester in the sidewalls. Tubular tires are favored for their low operating pressures and resistance to pinch flats, a solid benefit in the world of 'cross or gravel racing.