The Sirrus X 2.0 offers an unparalleled combination of comfort, efficiency, and nimble handling, excelling on asphalt, gravel, and all terrains in between. SMOOTH; COMFORTABLE AND EFFICIENT: The Sirrus X is characterized by the calmest ride in its class. With larger, confidence-inspiring tires, an upright riding position, and an incredibly intuitive single-speed drivetrain. RIDER-FIRST ENGINEERED™: At Specialized Bikes, each frame size and geometry is designed individually rather than simply "shrunk." For every size, tube lengths and diameters are tested to find the optimal balance of stability, weight, and responsiveness. The goal? No matter what frame size you ride, we ensure that you have the best ride experience in the world. AGILE: The light weight, exceptional pedaling efficiency, and steering precision combine to create a confident, almost telepathic handling experience.