Actually, Sheldon, there is another option. Back in the 70's, I decided that I liked the idea of the metric gear chart, but not the fact that was in meters. I proposed at the time a gear feet chart that was not well received. If you want to take a look, http://www.billbostoncycles.com/gear_feet.htm
gives you the distance traveled in feet per crank revolution, and also the mph at 88 RPM