The 2016 Cervelo S5 is as aero as a sliver and as light as a whisper. It begins with a carbon layup thats tuned to optimize stiffness laterally and torsionally while shaving every gram possible. Cervelos aero geniuses hit high gear with a dropped down tube and an extended rear wheel cutout to smooth the transition of air from the front to rear wheel with nary a hiccup.