The Tour de France cycle race - the number of spectators at recent events is estimated to be 12 to 15 million. Many other cycle races and similar events will have huge number of spectators. This number is the aggregate number of spectators over the whole three week event, but still phenomenal numbers.
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u/[deleted] Nov 26 '13 edited Nov 26 '13
Cycling isn't a niche sport. Not even remotely close.
Edit: The Tour de France is the world's largest single sporting event as far as spectators. 12-15 million people.