Offering an unprecedented combination of comfort, efficiency, and nimble handling, the Sirrus X excels on pavement, dirt, and any terrain in between. The Sirrus X provides the smoothest ride in its class. With bigger, confidence-inspiring tires, a slightly more upright riding position, and a super intuitive one-by drivetrain, this bike prioritizes rider comfort and control. Like all Specialized performance bikes, the geometry of each frame is uniquely crafted. For every frame size, each tube is specifically selected to achieve the optimal balance of rigidity, weight, and responsiveness, ensuring the world's best ride experience regardless of rider size. Class-leading lightweight construction, exceptional pedaling efficiency, and steering precision merge for confident, nearly telepathic handling characteristics. The bike floats over rough terrain with fast rolling Specialized Pathfinder tires featuring proprietary Gripton rubber compound.