Leadville Trail 100 MTB
The Leadville Trail 100 MTB is one of the oldest of a growing number of 100-mile (160 km) marathon mountain bike races. It was first run in 1994 and has become one of the best known marathon events in mountain bike racing. Entry is by lottery, with entries due by the end of January each year for the race that is run the second Saturday in August.
The Leadville Trail 100 MTB race is an outgrowth of the Leadville Trail 100 footrace. Both races were begun by Ken Chlouber as part of an effort to spur the economy of the town of Leadville after a local mine that employed many residents closed. The mountain bike race began after a sponsor of the footrace offered to sponsor it and to arrange for television coverage. The first running of the race drew just 150 entrants, while the 2009 edition allowed 1400 entrants.
The race is run on a 50-mile (80 km) out and back course, starting and finishing in downtown Leadville, Colorado, United States, at 10,200 ft (3,100 m) elevation. Major climbs include an over 3,000 feet (910 m) ascent from miles 40-50 to the Columbine mine, Powerline at mile 80, and St Kevins at mile 86. Total elevation gain is somewhere around 11,000 feet (3,400 m) when verified by GPS tracks of past competitors. 
Between 2003 and 2008, David Wiens, a 2000 inductee to the Mountain Bike Hall of Fame, won the race each year. In 2007, Wiens broke the 7 hour mark for the first time at 6:58:46. while holding off Floyd Landis by just under 2 minutes. In 2008, Wiens won again beating 7-time Tour de France winner Lance Armstrong by just under 2 minutes and setting a new course record of 6:45:45 . In 2009, Armstrong returned to win Leadville and establish the new course record of 6:28:50.9; David Wiens captured second place. Armstrong's involvement with the race has brought increased attention to the Leadville Trail 100 MTB, evidenced by the fact that race organizers offered a live webcast for purchase beginning in 2009. In 2010, Armstrong was unable to return due to injury, but his Team RadioShack teammate Levi Leipheimer, riding in his first mountain bike race, won and set a new course record of 6:16:37. In the concurrent women's race, two-time winner Rebecca Rusch also broke the course record, which had stood since 1997. In 2011, a conflict with the Tour of Utah kept Leipheimer away, but U.S. national cross-country bike champion Todd Wells turned in the second-fastest time ever to win, 6:23:38, while Rusch won the women's race again and shaved over 15 minutes off her previous record, with 7:31:46. 
- Scully, Lizzy (July 2009). "Ken Chlouber's Leadville". Mountain Flyer Magazine (13): 22.
- LeadvilleRaceSeries.com - Official website of the Leadville Trail 100 Mile MTB
- Leadville Trail Maps and Results - Website of Leadville Trail Race Maps and Archived Race Results
- 2008 Leadville Trail 100 Mountain Bike Race Finisher Data - 2008 Leadville Trail 100 Mountain Bike Race Finisher Data
- Leadville 100 MTB Course Flyover Map - The Run Scout
- Strava segment