Montezumas Revenge. Held in Montezuma CO for 20yrs from 86-06, the offical course was never completed in a 24 hour time period. Required you to summit a 14er and cross the continental divide almost 6 times. The lowest elevation you would ever be at during the race was about 9,500'. Many endurance mtb racers including Tinker Juarez competed in it back in the day. I hear someone is trying to start up a similar event called Summit Revenge, as its held up in Summit County.
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