Hit the link below to invoke a program that generates a
 table of bicycle gear ratios. It allows for 4 crank rings and
 20 cassette cogs. No, I am not anticipating a bicycle with
 80 gears. But this wide range does allow you to compare
 a number of gears at once. The table shows gear ratios,
 the gears ( CR / CS ), their positions numbered from the
 lowest to highest gears ( CR # CS # ), distance per pedal
 revolution, cadence, velocity, and pace. Clicking on
 column headers sorts the table entries.

 (Note: this applet requires JRE 1.4 or later)