I did the Civil War Century as my first century last week. I had trained mostly on flat terrain, and I suffered during the ride. There were many, many hills. It didn't help that my front shifter was broken, leaving me with only the big chain ring. I am already planning my training for next year. Challanging, but rewarding. I was on a Trek 1500 (all stock) and averaged 16.2 mph. Slow, but I was happy just to finish.