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 Rawge's Mini Chopper Information Site

Here is a calculator to help in determining gear sizes, tire sizes, and engine RPM to suite your needs when using a  jackshaft and sprockets. As always, this should be used only as a planning guide and final details should me calculated using your own math. This was designed to work with Internet Explorer, so I apologize if it doesn't work with some browsers.

Jack Shaft 1 (B) -  (# teeth or inches)  -------------
Jack Shaft 2 (C)-  (# teeth or inches)--------------
Drive Sprocket - Front (A) (# teeth or inches)-----
Driven Sprocket - Rear (D) (# teeth or inches) --
Rear Tire Diameter (inches, total rim & tire)------
Engine Rpm --------------------------------------------

          Expected Top Speed MPH

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