Current No. 1-Ranked Sky Procycling Returns to United States to Compete in America’s Toughest Cycling Race Taking place August 19-25, 2013, the 2013 USA Pro Challenge will feature 16 of the world’s top professional cycling teams, including UCI No. 1-ranked Sky Procycling, which includes 2012 Tour de France overall winner Bradley Wiggins and second place finisher Chris Froome. Comprised of UCI Pro, Pro Continental and Continental teams, the race will include some of the top talent in the sport. Taking riders on a heart-pounding journey through the Colorado Rockies, the eight-day stage race will travel nearly 600 miles from Aspen to Denver.