By Martyn Herman RIO DE JANEIRO, Aug 10 (Reuters) - The Americans have come up with a funky new track bike for the Olympics and everywhere you look around the inner-sanctum of Rio's velodrome there is space-age kit primed for action. Tony Purnell, former principal of Formula One motor racing teams Jaguar and Red Bull, is the latest boss of British Cycling's Research and Innovation department -- or to give it its more informal title "Head of Stuff". A self-confessed bicycle nut who admits to shamelessly trawling the internet looking for new gizmos and ideas, is in charge of everything from frames, to suits to training and says the team competing in Rio will enjoy a "nice little gain" compared to London when they scooped seven of the 10 titles. More...