Early aero bikes added mass to counter the slim aero tube profiles’ lack of rigidity, but Scott thinks more innovatively. Scott cleverly shaped its bikes’ tube like a cut-off aerofoil. It retains the ability to slip through the air without the need for an extended tail.
From Scott-sports.com: F01 Technology is based on the theory that a partial airfoil shape without the trailing edge can produce the same aerodynamic advantage as a traditional foil shape. Modern foil shapes are largely based on models and ratios created for airplanes by the National Advisory Committee for Aeronautics, but because bicycles attain speeds far less than those of airplanes, these ratios do not necessarily apply to bikes. SCOTT Aero Science engineers have thus developed F01 Technology to create unique, bicycle specific tube shapes which maximize aerodynamic efficiency at lower air speeds.
The foil is a true speed demon. On flatland it silently and quickly accelerates through the gears and seems to glide along the road surface. Never too firm or stiff to hinder progress, the all-out racing geometry means responsive handling and sharp, quick cornering.
The 2014 Foil 20 can handle any mountain or flat ride. Its frame saves 20 watts and therefore gives the rider a 4% to 5% overall gain in speed on flat rides or for fewer watts, the rider can maintain the same average speed, keeping them fresh for whatever effort is most important. The Foil’s IMP carbon construction allows for a lightweight and stiff structure - perfect for acceleration and climbing.
The frame and fork combination is light and nicely detailed: with carbon dropouts at both ends and neat touches such as an integrated chain catcher to protect the bottom bracket shell.
The downtube flares at the oversized bottom bracket junction, achieving several design goals. This construction adds lateral stiffness without increasing wall thickness, and the new bottom bracket mold disperses load to effectively halve the stress on this crucial junction. The shape of the downtube and bottom bracket carries seamlessly into the chain stays, further reducing turbulence and creating an additional aerodynamic benefit. Also, the drive-side outer diameter of the bottom bracket conveniently accommodates an SRM or power meter.
The Shimano 105 spec extends as far as the shifters, mechs and chainset. The brake calipers are Shimano’s dual pivot BR-R561, and the chain and cassette are from the downscale but still perfectly functional Tiagra group. Shimano’s modest R501 aluminum clinchers are shod with Continental’s Grand Sport rubber.