1- Choose Your Bike: The gearing fields will automatically change for you
2- Enter RPM or speed into green cells.
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. Vulcan digital speedometers are typically 10% fast from the factory.
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)