Eddy Merckx
In the French comedy Les Aventures de Rabbi Jacob (The Mad Adventures of Rabbi Jacob) (1973) with Louis de Funès, de Funès' character hears a conversation between a kidnapper and his victim, a revolutionary. When the revolutionary says: "The revolution is like a bike ( http://likeabikes.com  ): When it doesn't move forward, it falls.", de Funès attributes the line to Eddy Merckx. One of the kidnappers corrects him and says Che Guevara once said this.