I have done the Test of Endurance 50 and it was miserably hard but fun. Adam Craig won that crazy event on a 36-16 bike and beat Barry Wicks (who was on a geared bike). I would walk half this event as it was steep gravel road after another. Amazing!
2009 Test of Endurance 50 post race Adam Craig and Barry Wicks - YouTube
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Thread: How can you do this?