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. Future Shock 1.5 delivers 20mm of compliance to give maximum comfort and control over the rough stuff. Added Carbon Fork and an A1 SL alloy frame delivers a build 1.6lb .8kg lighter than the 3.0 model–no heavy hybrid featuring a mountain style suspension fork comes close. Wide-range 1x11 Shimano CUES shifting delivers precise shifting. Frame Specialized A1SL Premium Aluminum Fitness Geometry butted tubing internal cable routing flat-mount disc quick-release Plug + Play rack/fender mounts Fork Specialized FACT 9r Carbon Monocoque flat-mount disc 12x100mm thru-axle low rider mounts Plug + Play fender mounts Future Shock 1.5 Seat Binder Bolt-type 31.8mm Stem Future Stem Comp Grip Specialized Neutralizer Body Geometry locking grip Handlebars Alloy Mini Rise 9-degree backsweep 15mm rise 31.8mm SeatPost Alloy 2-bolt 14mm offset 27.2mm Saddle Body Geometry Power Sport steel rails Front Brake Shimano BR-MT200 hydraulic disc 160mm Rear Brake Shimano BR-MT200 hydraulic disc 160mm Rear Derailleur Shimano Cues 11-speed w/ Shadow Plus Shift Levers Shimano Cues SL-U6000 11-Speed Cassette Shimano CS-LG400-11 CUES 11-Speed 11-50T Chain KMC eGlide for 11-Speed Cues Crankset Prowheel Alloy XXS - XS: 165mm S - M: 170mm L - XL: 175mm Chainrings Narrow Wide Steel 42T Bottom Bracket Threaded BSA 68mm 24mm spindle Rims 700C disc double-wall alloy 22mm depth 21mm internal width 32h Front Hub Alloy sealed cartridge bearings Center Lock 12x100mm thru-axle 24h Rear Hub Alloy Center lock Disc High-Low Flange Sealed Cartridge Bearing 32H 12mm Axle 142mm Spacing 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.