The ratio calculator program has seven inputs. Motor RPM, drive sprocket size, driven sprocket size,
tire diameter, and vehicle MPH. There are also two additional sprocket entries if you are using
a jackshaft. You enter six of the variables and it calculates the seventh.

Click on the image to download, 1.5 MB, Windows only.
This software is Freeware. Feel free to use and distribute it as you choose.
Donations to help with further software development are always welcomed at out Paypal address :