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2001 Raptor ONLY

Primary Reduction Ratio (2.088)

Secondary Reduction Ratio 40 rear/13 front (3.076)

1st gear (2.428)
2nd gear (1.526)
3rd gear (1.238)
4th gear (1.047)
5th gear (0.904)

reverse (1.750)

The rear tire on the Raptor is 20".

Here is a cool site that might save you the trouble Generic Converter

You have to enter each gear ratio individually to come up with the MPH for a given gear ratio at a given RPM.

Here is a site for Honda 400ex that computes each gear for you

400ex calculator

/NotuRaptor

 

I checked out the generic converter and it is neat. It verified that my excel spreadsheet works. Thanks for the links.