Enter the pinion size (in number of
teeth), spur size (in number of teeth), tire size (in decimal inch value, ie for
2 1/2", enter 2.5), and your motor/engine's rated loaded RPM (no commas)
and then click "Calculate".
The Gear Ratio, Inches Per Revolution (IPR), Feet Per
Second (FPR) and Miles Per Hour (MPH) will be calculated for you!