The third edition of the USA Pro Tour Challenge kicked off yesterday with a circuit race around Aspen, Colorado. This race is certainly one of the toughest in the world with brutally tough climbs going up and over 12,000 feet at times. This will be a true test of fitness and courage among American and European racers including this year’s Tour de France champion, Chris Froome. A few videos are below including the sizzle real and a recap from yesterday’s opening stage in Aspen where Peter Sagan took the W!