Lance Armstrong and RadioShack teammate Levi Leipheimer will race in the 2010 Leadville 100 mountain bike race next weekend.

Armstrong had said earlier he was leaning toward entering and race organizers say they received Leipheimer's entry form for next Saturday's race.

The race starts at 10,500 feet, climbs 2,000 more feet and is considered the nation's highest-altitude endurance test. Armstrong is the defending champion, winning last year in a record time of 6 hours, 28 minutes, 50 seconds.

Leipheimer, who won his second straight Tour of the Gila this year, did not participate in last year's race in Leadville. This will be his first mountain bike race.