This cycling event much-practised and bet on in Japan became the Olympic flavour-of-the-month at the Sydney Games. It is a sprint pitting six adversaries against one another. The first cyclist to cross the line at the end of two laps at full speed is the winner. All - or nearly all - measures are permitted to clear a path to the front.In Japan, Keirin racers learn their art just like Sumo wrestlers in specialised schools. There they observe strict rituals. During competition, the riders are completely shut away to vouchsafe the validity of the betting. The best win considerable sums of money.In Sydney, Frenchman Florian Rousseau became the first Olympic Keirin champion.