German bicycle designer Didi Senft, better known as 'El Diablo' or the Tour de France Devil, rides his 'Laufrad' (Running wheel) in Mannheim June 12, 2007. Senft presented his Laufrad, based upon the two-wheeled velocipede designed by German inventor Karl Drais, to mark the190th anniversary when Drais first rode the world's first velocipede in Mannheim. Senft's 'running wheel' is made of aluminium with a height of 2.86m, a length of 6.33m and a weight of 41 kilos. REUTERS/Alex Grimm (GERMANY)