Breaking Away: A comedy about growing up. Pretty much a bike racing movie.
American Flyers: Sports physician Marcus persuades his unstable brother David to come with him and train for a bicycle race across the Rocky Mountains. Tumors ensue.
The Cycle of Love: A clumsy businessman is made fun of by the neighborhood children because he rides his bicycle to work every day
Double Rush: A bike messanger deals with competition, dangerous drivers, and nagging boss
These are only the few I know that are ABOUT biking. I know plenty with biking in them. Post any more you may know about.