query: How many teams participated in Vuelta a Espana in 2012?
passage: List of teams and cyclists in the 2012 Vuelta a España
All eighteen UCI ProTeams were automatically invited and were obliged to attend the race. Four UCI Professional Continental teams were given wildcard places into the race, to complete a 22-team peloton.
passage: 2012 Vuelta a España
The 18 ProTour teams: