You have places to go, people to see, and fitness goals to achieve. We get it—life moves pretty fast, so it\'s a good thing Specialized made the Specialized Sirrus 4.0 Hybrid Bike to help you with all of it. Wherever you\'re heading, Sirrus will take you there. The Specialized Sirrus 4.0 Hybrid Bike features powerful hydraulic disc brakes that provide reliable stopping power all year round in any condition, comfortable, ergonomically designed Body Geometry touchpoints are there to take the sting out of longer rides. So, as you push yourself to reach your goals, you\'ll feel more connected to your bike and know that you have the perfect partner with the Specialized Sirrus.Reflective graphics on the frame and tires for maximum visibility in low light conditions.Upright position with Body Geometry touchpoints for better comfort and maximum control.The 2021 Specialized Sirrus 4.0 FeaturesFrame:Specialized FACT 9r carbon, Fitness Geometry, 12x142mm thru-axle, internal cable routing, flat-mount disc, Plug + Play fender mountsFork:Specialized FACT carbon, 12x100mm thru-axle, flat-mount disc, Plug + Play fender mountsCrankset: 2-piece, forged arms, 24mm spindle, steel chainrings w/ chainguardGearing: MicroSHIFT, 9-speedBrakes: Tektro HD-R280, hydraulic disc, resin pads, flat-mount, 160/140mm rotorsWheelset:700C disc, double-wall alloy, 22mm depth, 21mm internal width, 28hTyres: Specialized RoadSport Reflect, Wire bead, Blackbelt/Endurant Casing, 700x32c