Cervélo has been the pioneer in aero road bike design since 1996 and the S5 is the latest evolution in Cervélo's lineup of wind-cheating machines. Evolving from the S3, which claimed victories on cobblestone Tour stages, mass sprints and at the World Championships, the S5 is stiffer and more aerodynamic.
Aerodynamics have always been important for speed. The better the aerodynamics, the lower the drag, the faster you can go. The faster you can go without any wasted energy, the more comfortable you are. An aero advantage can help you extend your limits. Aero is always on and can benefit anyone. Let the Cervélo S5 aero design help you (be the best rider you can be), and STAY AHEAD!
The most obvious visual difference of the S5 compared to the S3 is the extended rear wheel cutout, which smoothes airflow from the frame to the wheel. Another aero advantage is the dropped downtube, which minimizes turbulence behind the fork crown. The seat stays of the S5 have also been designed to shield the rear brake, further improving aerodynamics.
The BB area is massive thanks to the BBright bottom bracket; an improvement on the BB30 design. Like BB30, BBright utilizes a 30mm spindle with a standard outboard bearing spindle length. However, what makes BBright it special is that it allows frame designers to extend the bottom bracket shell all the way to the crank on the non-driveside (similar to a BB86), yet retains the standard width on the driveside. With this system, Cervelo achieves the optimal chain-line with the maximum frame/crank stiffness possible.
The S5 is built to accommodate water bottles, with two different mounting options on the downtube. Use the lower mounting position for the best aero advantage. This bike also has the ability to double as a triathlon or time trial bike thanks to the two position seatpost, which allows the rider to achieve a more aggressive aero position.
For more on the development of the S5, check out this video.