The Leadville 100 Mountain Bike Race is an ultra-endurance high altitude race in Colorado. The puipose of this study is to correlate the characteristics of the biker and his/her equipment with performance in the race. About half of the competitors (n=566; 46 3%) completed a pre-race survey. The information about racers' age, gender, place of residence and race time is available to the public. Most participants (90.4%) were male with an average age of 42 years. Tlie majority (72.6%) finished the race successfully under the 12 hour cut-off time and most reported to have full suspension bikes (61.9%) with 26" wheels (70.9%) Aluminum was the most popular frame composition (48%), followed by carbon fiber (35.3%) and titanium (11.2%). .
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