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, it delivers comfort without compromise. 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 regardless of your size. Class-leading lightweight construction, exceptional pedaling efficiency, and steering precision merge for confident, nearly telepathic handling characteristics. The lightweight A1 Alloy frame with clean internal cable routing provides the foundation for nimble performance. Maximum control comes through intuitive shifting with 1x9, 11-46t wide range gearing and powerful hydraulic disc brakes. Fast rolling Specialized Pathfinder 40c tires featuring proprietary Gripton rubber compound float over rough terrain with confidence.