Yeah its official http://thepaceline.com/members/lance....aspx?cid=2876
"Austin, TX – Seven-time Tour de France champion Lance Armstrong announced today that he will not be racing the Leadville Trail 100 Mountain Bike Race scheduled for August 11, 2007.
Mark Higgins, Armstrong’s manager, said, “Lance had a scheduling conflict come up and he regrettably cannot participate in the event.”
The Leadville 100 race is a very demanding MTB race in Colorado at altitude (10,200’) and includes approximately 14,000’of elevation gain. For more information on this event, please visit"