Eric De Place, of Sightline Daily put together a few very informative charts in his post that goes a long way to help visualize the numerical reality of who is bicycling in America. Most notable is the pie chart above that goes far to disprove the false notion that most cyclists are "rich, yuppie elitists." In fact, that is far from the truth with the poorest making up the largest portion of cyclists but with people of all economic fortunes almost equally represtend.
The data for Da Place's article comes from a new report from our very own John Pucher of Rutgers University and his protegee Ralph Beuhler who is now at Virgina Tech. The report title "Analysis of Bicycling Trends and Policies in Large North American Cities," take a look at trends in number of large American cities and takes special focus on New York City highlighting its achievements as well as its failures.
I highly advise that you take a look at both De Place's short blog post and Pucher and Beuhler's report.