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18
There were 199 riders starting the 2009 tour.
Between 18-22 teams with 9 riders in each.
12
One for each time the race has been held of course!
In the year 2010, there are 22 teams.
Simply because a group of riders can do better than riders competing on their own, which turns most longer races into team events. If you want bicycle races that are run individually, look for time trial events.
Over a million
There are typically around 20 teams, although it varies each year. Each team with 9 riders.
A little less than one for each year of racing. Some riders have won several times, some riders have been stripped of their victories due to doping discoveries.
Any old how. Some will ride the Team Bus. Many will fly. No one will go by bicycle.
About 200 riders. 9 in each team and about 22 teams. Then hordes of support personnel.