Felt DA1 Di2 (2013)

Years of research, engineering and wind-tunnel development went into the DA1, and the results are obvious. The DA is the weapon of choice for time trialists like Kristin Armstrong and Patrick Gretsch as well as triathletes like Terenzo Bozzone and Andi Bocherer. With UHC Ultimate+Nano carbon fiber material—shaped through extensive Computational Fluid Dynamics engineering and real-world testing—it’s 14% more aerodynamic and 13% stiffer than the previous-generation DA. It’s also optimized for Shimano Di2 11 Speed electronic shifting, with internal cable routing and an integrated battery mount. When every second counts, go with the DA1.