The Leadville Trail 100 annually tests the grit and mettle of more than a thousand brave souls who take to the start .
The Leadville Trail 100 is a 100 mile mountain bike race held in the high mountains of Colorado .
The Leadville Trail 100 , a 100 mile mountain bike race held in the high mountains of Colorado , annually tests the grit and mettle of more than a thousand brave souls who take to the start .