You can read about just about all my brevet (audax's) here:
http://www.machka.net/brevetstories.htm
Most have photos and everything!
But my first was a 200K which I rode on my 40 lb, knobby-tired mtn bike because I had torn my left subscapularis (front muscle of the rotator cuff) a few weeks before and couldn't put any weight on my left arm. That mtn bike is very upright, so I could just sit and rest my hand on the bar instead of leaning. I finished it in 12 hours.