1- Choose Your Bike: The gearing fields will automatically change for you
2- Enter RPM or speed into green cells & click anyplace on the page.
3- View results in bold.
Note, there are additional changeable cells (bottom left) for those who measure speed in KPH
and for those whose speedometers are not correct.
Let Engine RPM =
Let Vehicle Speed =
(for motorcycles only;
% of max RPM
use 1.0 for cars)
Final Drive Reduction
Tire Diameter (inches)
Engine Redline (RPM)
(+) If speedo reads fast and (-) if the speedo reads slow
Enter (0) to see actual vehicle speeds
Units (MPH or KPH)