© GreenPark Productions and Modern Motorcycling Ltd. © GreenPark Productions and Modern Motorcycling Ltd.

 

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If you're racing vintage you may find this calculator handy. Enter data for items 1 to 6 , calculations complete as you add more data or click on "Make Calculations" button to insure results update. When entering "Wheel diameter", be sure to include the tire (might mean a trip to the garage to measure it). It is assumed that gearbox is in top gear and the ratio is 1:1.
1.  Maximum RPM:
2.  Size of engine sprocket (teeth):
3.  Size of clutch sprocket (teeth):
4.  Size of gearbox sprocket (teeth):
5.  Size of rear wheel sprocket (teeth):
6.  Wheel diameter (inches):

Primary ratio:
Secondary ratio:
Overall ratio:
Speed: mph
kph
Our thanks to Mark Mcknight

 
    MODERN MOTORCYCLING LTD.
    2816 Commercial Drive
    Vancouver, BC.
    V5N 4C6
    Phone — (604) 876-0182/8131
    Fax — (604) 876-3676
© GreenPark Productions and Modern Motorcycling Ltd.
Revised — November 2004.
© Copyright  MCMXCIX, MM, MMI, MMII, MMIII, MMIV, MMV,  Modern Motorcycling Ltd.
Another Quality Product by  
We will remember September 11, 2001