Molding a frameset with wind cheating aerodynamics that still exhibits the quality and handling of a race bike is one of the great challenges faced by contemporary manufacturers. Of course, given that the company's decades long history has largely defined the industry's course in frame design, we'd expect Colnago to be among the leaders of bringing ride quality and aerodynamics together. With a claimed 7. 54% improvement in aerodynamics compared to Colnago's previous Flight model, the frameset of the K. Zero Ultegra Complete Bike does its part to help zero out drag, and the full Ultegra drivetrain means that the frame's aerodynamic gains aren't scuppered by poor shifting and a heavy, inefficient crankset. As with any frame, the K. Zero is only as good as the raw materials from which it's born, and Colnago's exclusive use of Toray's Japanese carbon means the K. Zero begins with an advantage over most aerodynamic frames on the market. Most Toray carbon is sourced from China or elsewhere, but the Japanese carbon used in the K. Zero is the most consistent in the world, guaranteed perfect every time, which is why it's the same stuff that Boeing insists on for its aircraft. This carbon is so sought after that Toray enjoys a degree of selectivity in who it sells it to, so Colnago is the only cycling manufacturer able to use it for 100% of its frames. Regardless of construction methods, Colnago knew the K. Zero would be judged first by its one cyclist against the wind properties. Beginning with a catalog of NACA derived tube profiles, Colnago adapted tube shapes to address the drag coefficients affecting each disparate element of the frame in real world conditions, not just the idealized time trial courses of marketing materials. Even the K. Zero's wind tunnel testing was always done with a rider on board and pedaling. This insistence on real world conditions means that ancillary elements like the brake calipers tucked discreetly behind the fork and bottom bracket ...