The Sirrus X offers an unparalleled combination of comfort, efficiency, and agile handling, impressing on asphalt, gravel, and any terrain in between. COMFORTABLE, SMOOTH, AND EFFICIENT: The Sirrus X delivers the smoothest ride in its class, featuring wider, confidence-inspiring tires, a slightly more upright seating position, and a super intuitive one-by drivetrain. RIDER-FIRST ENGINEERED™: At Specialized Bikes, each frame size and geometry is individually designed rather than merely downsized. For each size, tube lengths and diameters are tested for their optimal balance of stability, weight, and responsiveness. The goal? No matter what frame size you ride, we ensure you have the best riding experience in the world. COMFORTABLE: Industry-leading weight, exceptional pedaling efficiency, and flexible handling combine for nearly telepathic driving properties.