The 2013 S-Works road shoe has been in development for two years and seen 35 prototypes. The result is what they call the lightest, stiffest, best fitting cycling shoe ever created. It gets a new last with thermo bonded upper and two S2 Boa retention systems plus a small strap on the forefoot. The new SL2 FACT carbon outsole has an asymmetric design, and the entire package tested 7 seconds faster over a 10k time trial than a competitor’s traditional shoe.
How? primarily because it’s super stiff, which maximizes power transfer. As an anecdotal explanation, Dr. Andy Pruitt, Specialized’s in-house fit guru behind Body Geometry, said Tom Boonen was using another brand shoe that wasn’t as stiff. Because the sole had too much flex, he was putting his cleats too far back, which didn’t allow him to maximize power transfer. With the S-Works shoes, he could put the cleat further forward (where it should be, generally under the ball of the foot), which allowed him to use his foot as a lever and improve efficiency, too.
Details, prototypes and so much more from their component (bars, pumps, computers, etc.) and clothing (helmets, gloves, etc.) lines after the break…
The glamour shot.
Less glamourous duct tape and other prototypes. Pretty cool to see how many design variations were tried.
The outsole was created through pressure mapping. The foot leans inwards, so the structure was designed with more material on the medial side where more pressure is put on the sole.
The outer edge of the base plate is just 1.7mm thick. Under the cleat is just 4.5mm, which is still thin. In order to make it strong enough, the carbon wraps up the inside of the upper and it uses a box section construction that sandwiches a noncompressible lightweight PU material. They provide their own short cleat screws because the ones that come with most pedals are too long for their super thin soles.
Air vent is offset to a nonstructural section. The upper has two mesh sections with plenty of perforations throughout. They have replaceable heel lugs, and small gripper dots inside the heel cup to keep your foot in place.