The Litening AIR C:68X SLT takes the UCI rulebook on weight and frame design and transforms it into an ultralight, aero-sleek carbon race machine whose very essence is speed. From the carbon-spoked, carbon-rimmed Newmen Streem Climbing 35/38 Vonoa wheels to the carefully honed frame tube profiles, every detail is focussed on shaving seconds. Shimano's range-topping Dura-Ace Di2 components – with built-in power meter – transfer your power to the road and bring you safely to a stop. There's fast, and there's very rapid indeed. Guess which one this bike is?