With the 2012 USA Pro Challenge less than two weeks away  organizers have announced their provisionary team rosters for the race.  The event will feature six of the top 13 finishers from this year’s Tour de France including two Americans, Van Garderen and Chris Horner.  Also on the roster are 10 of the top 12 finishers from last year’s USA Pro Challenge.  Taylor Phinney of the USA’s BMC Racing Team, who recently took two fourth place finishes at the London Olympics, will participate as well.  In all, the elite roster will include 126 riders from 24 countries.