Zipp further refines handlebar aerodynamics and shaping with the SL 70 Aero Handlebar. Crafted from unidirectional carbon fiber, the SL 70 Aero has a winged top shape for optimum air flow over the bars, which Zipp claims saves an average of 6. 4 watts over a round bar. The drops ergonomics aid in responsive handling through tight sections, with a 70mm reach, while the shaping allows for you to get low and sprint towards the finish.