The Sirrus X offers an unparalleled combination of comfort, efficiency, and nimble handling, excelling on roads; off-road, and in other terrains. SMOOTH; COMFORTABLE AND EFFICIENT: The patented frame design of the Sirrus X within the Compliance Junction ensures the smoothest ride in its class. The vertical flexibility without compromising lateral stiffness provides more comfort, control, and efficiency on all roads; whether paved or gravel. RIDER-FIRST ENGINEERED: Like all Specialized Carbon Bikes, the geometry of each frame is unique. This means that for each frame, every tube size and carbon layup is specifically chosen to achieve the optimal balance of stiffness, weight, and responsiveness, ensuring that you, no matter what size you ride; will experience the best riding experience in the world. NIMBLE: Industry-leading; lightweight, exceptional pedaling efficiency and steering precision combine for safe, almost telepathic handling characteristics.