I did my 1st century this past Saturday, the 2011 Reach the Beach. Prior to this my longest ride was 40-50 miles. I didn't train enough and I didn't have any riding partners so it was as much a mental exercise as a physical one. With an off-course detour I covered 106 miles in 7:42. Only issue that I had was moderate to severe leg cramps that started around mile 30 and lasted for about 40 miles. It got bad enough that I wasn't sure if I could make it but I wasn't about to quit. I just pedaled through the pain and only stopped long enough to fill my water bottles. I ate and drank on the bike. Are there any specific cause of the cramps and what is the best way to avoid them or work through them if I experience that again? Other than the cramps I had a great time and I"m looking forward to the next one.