The Sirrus X offers an unparalleled combination of comfort, efficiency, and nimble handling, excelling on asphalt, gravel, and everything in between. SMOOTH; COMFORTABLE AND EFFICIENT: The Sirrus X provides the smoothest ride in its class. With wider, confidence-inspiring tires, a slightly more upright seating position, and a particularly intuitive 1x drivetrain. RIDER-FIRST ENGINEERED: As with all performance bikes from Specialized, the geometry of each frame is individually crafted. This means: For each frame size, the tube dimensions are specifically chosen to achieve the optimal balance of stiffness, weight, and responsiveness. This ensures that regardless of frame size, you always experience the best possible ride. AGILE: The low weight, exceptional pedaling efficiency, and steering precision combine to create a confident, almost telepathic riding behavior.