Inner soft gripper elastic on bottom hem
because we know light weight is a key ingredient to creating magical ride quality
11% more efficient and 5% lighter than any other endurance tire on the road*
Materials - Compressive four-way stretch fabric
tough trail construction with additional bead to bead protection for exceptional puncture resistance
Sirrus X 4.0 Gravel Inner soft gripper elastic onOffering 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