Offering 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 uniquely crafted. This means that for every frame each tube size is specifically selected to achieve the optimal balance of rigidity weight and responsiveness to ensure that no matter what size you’re riding you will experience the world’s best ride. NIMBLE: Class-leading light-weight exceptional pedaling efficiency and steering precision merge for confident nearly telepathic handling characteristics. Lightweight A1 Alloy frame with clean internal cable routing. Maximum control through intuitive shifting with 1x9 11-46t wide range gearing and powerful hydraulic disc brakes. Float over rough terrain with fast rolling Specialized Pathfinder 40c tires featuring proprietary Gripton rubber compound. Frame Specialized A1 Premium Aluminum Fitness Geometry butted tubing internal cable routing flat-mount disc quick-release Plug + Play rack/fender mounts Fork Hi-Ten steel flat-mount disc Plug + Play fender mounts low rider rack mounts quick-release Handlebars Alloy Mini Rise 9-degree backsweep 15mm rise 31.8mm Stem 3D-forged alloy 31.8mm 7-degree rise Grip Specialized Neutralizer Body Geometry locking grip Saddle Bridge Sport Steel rails 155/143mm SeatPost Alloy 12mm offset 2-bolt clamp 27.2mm Seat Binder Bolt-type 31.8mm Front Brake Tektro 2-piston hydraulic disc Rear Brake Tektro 2-piston hydraulic disc Rear Derailleur Shimano Cues RD-U6000 11-Speed Shift Levers Shimano Cues SL-U6000-11R 11-Speed Right Cassette Shimano Cues CS-LG400-11 11-Speed 11-50T Chain KMC eGlide for 11-Speed CUES Crankset Prowheel Alloy XXS - XS: 165mm S - M: 170mm L - XL: 175mm 42t Chainrings Narrow Wide Steel 42T Bottom Bracket BSA square-taper 68mm Rims 700C disc double-wall alloy 22mm depth 21mm internal width 32h Front Hub Alloy 6-bolt disc loose ball bearing quick-release 32h Rear Hub Alloy 6-bolt disc 8-/9-speed freehub loose ball bearing quick-release 32h Spokes Stainless 14g Front Tire Pathfinder Wirebead Fast Gravel 700X40C Rear Tire Pathfinder Wirebead Fast Gravel 700X40C Inner Tubes Standard 40mm SV 700x32-50 Pedals Specialized platform As with any product specification is subject to change without prior notification. You are advised to confirm current specification before buying. Please note that this bike does not come with pedals.