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  • gearratio.exe is the file that you can down load from:

    http://jimsitton.net/ratiocalc/

    Then is should be self explanatory from there.

    The file actually loads onto you computer so if you don't want one like that there are other that are online use, but I used my virus protection software and checked it. I keep it on hand and it works nice, just note it is only so good as it does not take into account friction, horsepower, and a slew of other things so speed will be slower on level surface of course.

    MT
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