Saturday August 13th is the return of one of the oldest and most well-known endurance mountain bike races in the world, the Leadville 100.  Leadville hosts some of the biggest names in the sport and has come to be known as one of the most physically demanding races in the United States.  With a starting elevation of over 10,000 feet and climbs reaching 12,000 this 100-mile trek challenges even the toughest riders.  As a race that was originally started on 1994 as an effort to bring work to Leadville's mining community, Leadville has grown in publicity and popularity substantially over the last two decades. The race originally had 150 participants and has grown to 1,400 today, all whom must earn a spot or be selected to compete.