The winner of the Boston Marathon this year came in right at 2 hours - I figure if a person can run an average of 13 mph (about 22 kph), I ought to be able to ride a bicycle that fast.

My commute is about 4 miles going in, 4.5 coming home. It's pretty easy to keep a 13+mph average. It's those longer rides on the weekends that are harder to maintain the speed.

c~