The Litening AIR C:68X SLT takes the UCI rulebook on weight and frame design and translates it into an ultralight, super-efficient carbon race machine whose very essence is speed. From the carbon-spoked, carbon-rimmed Newmen Streem Allround 49/54 Vonoa wheels – shod with 28mm Conti GP5000 S TR tyres – to the carefully honed frame tube profiles, Full Internal Cable Routing and IC Aero handlebar, every detail is focussed on shaving seconds. And Shimano's range-topping Dura-Ace Di2 components – including a crankset with 4iiii 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?