Sirrus X 1.0Offering an unprecedented combination of comfort, efficiency, and nimble handling, the Specialized Sirrus X 1. 0 Bicycle excels on pavement, dirt, and any terrain in between. Providing the smoothest ride in its class, with bigger, confidence inspiring tires, a slightly more upright riding position, and a super intuitive one by drivetrain. Like all Specialized performance bikes, the geometry of each frame is uniquely crafted. This means that for every