Whether you're a lead-out man, the domestique who chases back breaks, or the team's designated sprinter, you can go faster on an aero bike. Aerodynamic drag accounts for as much as 90 percent of the overall resistance you encounter or a ride and less drag simply equals more speed. Imagine having that, plus a smooth ride, proper stiffness needed for rock-solid sprinting, refined geometry for sure handling, and some good looks for the cherry on top. Well then, you'd have the S3 Ultegra Di2 R8050 Complete Bike, one of the picks of our litter.Cervelo honed the S3's aerodynamics after spending countless hours in the wind tunnel testing and refining designs. This particular disc model features full internal cable routing thanks to a new bar and stem that hides the brake and shift housing from the wind for improved aerodynamics. Additionally, the new frame profiles work together to reduce drag so you simply go faster. Cervelo calls this True Aero which combines these specific tube shapes, sizes, and design features to improve aerodynamic flow across the bike.The most aero bike available is meaningless if it's a wet noodle though, so thankfully Cervelo worked hard to increase the stiffness at the bottom bracket shell ensuring efficient power transfer and that every watt goes straight to the rear wheel. Just like every other Cervelo, the S3 uses its BBright shell which takes advantage of oversized frame tubes that are stiffer and lighter. With the BBright system, larger sized tubes are used at the seat tube, down tube, and non-driveside chainstay. The benefit is an increase in stiffness and pedaling efficiency while achieving a lighter weight frame that's compatible with all major bottom bracket standards. Stiffness doesn't just end there and Cervelo beefed up the head tube junction that conspires with its geometry for more confidence inspiring handling with impressive stability and precision when cornering and descending at speed.Cervelo's mastery of carbon layups and...