Cervelo has released a new aero road bike for 2012 called S5. Compared to the S3, the S5 design offers 12% greater stiffness. While a curved seat tube is integrated with tucked rear wheel from their TT bikes, the fit and geometry reflects those of the S3s so it works well for normal riding and racing.
Its smooth frame hardly registers beyond the frontal profile of the tire. Keeping the shift cable loops concealed. Moreover, the seatstays were engineered to partly hide the rear brake from the airflow.
Designed to be the most aerodynamically efficient bike possible, the 2012 Cervelo S5 Aero Road Bike guarantees top performance. While the downtube maximizes aerodynamics, the S5 frame also features amazing stiffness, ride quality, and incredible speed.