The Sirrus X 3.0 Step-Through EQ offers an unparalleled combination of comfort, efficiency, and agile handling, excelling on asphalt, gravel, and everything 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 a super-intuitive single-speed drivetrain. RIDER-FIRST ENGINEERED™: At Specialized Bikes, every single frame size and geometry is individually designed rather than simply "shrunk." 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 experience the best ride feel in the world. AGILE: The low weight, exceptional pedaling efficiency, and steering precision come together for a commanding, almost telepathic riding experience.