Sirrus X 4.0 Gravel tough trail construction with additional

tough trail construction with additional bead to bead protection for exceptional puncture resistance

it's important to capitalize on years of R&D and pro rider feedback to create the fastest time trial bike—for all courses

Inner soft gripper elastic on bottom hem

11% more efficient and 5% lighter than any other endurance tire on the road*

without constricting any upper body movements

Sirrus X 4.0 Gravel tough trail construction with additionalOffering an unprecedented combination of comfort, efficiency, and nimble handling, the Sirrus X excels on pavement, dirt, and any terrain in between. SMOOTH; COMFORTABLE, AND EFFICIENT: Sirrus X provides the smoothest ride in its class. With bigger, confidence inspiring tires, a slightly more upright riding position, and a super intuitive one by drivetrain. RIDER FIRST ENGINEERED: Like all Specialized performance bikes, the geometry of each frame is