"Alleycats", bicycle messenger racing.
source: http://www.digave.com/videos/
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- Get_Cape
- added this
"An Alleycat race is an informal bicycle race. Alleycats almost always take place in cities, and are often organized by bicycle messengers. The informality of the organization is matched by the emphasis on taking part, rather than simple competition. Regularly organized Alleycats can be found in cities across North America, Europe and Asia. Many smaller cities with no cycle messenger population are also home to alleycats run by the burgeoning urban cyclist subculture." The link is a site with a bunch of different alleycat races, if you like extreme sports, or like watching extreme sports, or like watching people on bikes get nearly demolished by taxis, then check it out!