Motoball... Where Have You Been Hiding?
Motorcycle Polo, or Motoball, as it is called in Europe, is essentially a soccer game where the players are on motorcycles. The ball is typically larger than a soccer ball and may be kicked or manipulated with the bike. Motorcycle Polo was very popular in the United States during the Depression years when Uncle Harry played it. It required extraordinary strength and skill.
The bikes used were Harleys and Indians with foot clutches and hand shifts.
The game is very popular in Europe today, albeit with smaller and more agile dirt bikes with a hand clutch and hand brake. The photos show that it is a dangerous contact sport.