Keirin...

that weird cycle race where they chase a silly motorbike!  This interesting note is from Wikipedia - " "racing wheels" is a form of motor-paced cycle racing in which track cyclists sprint for victory following a speed-controlled start behind a motorized or non-motorized pacer. It was developed in Japan around 1948 for gambling purposes and became an official event at the 2000 Olympics in Sydney, Australia."  Courtesy of BBC2