Video done by Michele Bufalino. Subtitles by Alberto Pinsino. in first part of this video Images from Rai but in second part, investigation by Michele Bufalino. This video shows how mechanic doping may be done. Do any professional cyclist use a bike with engine? In the video taken out from RAI, we'll see how the bike works. And we'll analyse recent great performances of Fabian Cancellara in Tour of Flanders and in Paris Roubaix, with images thay may be considered as incontrovertible evidences.