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Use the
information for your engine gearing charts
(select engine below) to determine front and
rear sprocket combinations. The numbers in
the charts represents the final drive ratio.
This gearing ratio or final drive ratio, is
the number of times the crankshaft turns to
every one turn of the rear axle. |
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The formula for
calculating this yourself is:
Final Drive Ratio = Primary ratio x
Secondary ratio x Tertiary ratio
Where ... |
- Primary ratio = crankshaft to main
transmission shaft ratio, # of teeth on the
trans shaft divided by # of teeth on crank
shaft.
- Secondary ratio = the ration between the
gears in the transmission, these of course will
be different for each gear that you have in the
transmission.
- Tertiary ratio = the rear rear sprocket # of
teeth divided by the front sprocket # of teeth
(ie: a 13 - 51 sprocket combination =
3.923 ratio).
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