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  1. #1
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    Rockaway, NJ, United States
    Member No: 59644 p.devita is an unknown quantity at this point p.devita's Avatar
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    Dec 2002
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    TOOL: Graphical Transmission Gear Ratio Calculator

    Neat online tool if you are looking to change your Wheel Size or Differential.

    Plug in your current spec on the left, and proposed spec on the right, hit Calculate/Graph button and display the theoretical maximum MPH in each gear and impact on top end speed of changing the Wheels and/or Differential Gear Ratio.

    I confirmed my upgrade of roughly 12% gain by going from a stock 2.81 differential to a 3.15 differential. My theoretical top end speed dropped from 208 to 185.

    Graphical Transmission Gear Ratio Calculator


    "Everything works out in the end. If it hasn't worked out, it's not the end."

    My 8 web site.
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    1995 840CiA Cosmos Black/Black

  2. #2
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    Member No: 191364 johan37 is an unknown quantity at this point johan37's Avatar
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    Apr 2012
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    I have found gear calculator on cargister site and it works quite nice

    Gear Ratio Calculator
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