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This easy to use tool will help you quickly calculate the RPM or speed of your motorcar. There are many reasons you may want to know the relationship between rpm and speed. If you know the hp and torque curves of your engine you can then calculate the proper pulley size that will yield the most efficient operation of your Fairmont. This data is also helpful when configuring your car for the challenges of each railroad. The worksheet has two separate columns, this allows you to enter data for two different pulley configurations and compare them at the same time. To use this worksheet you may enter in the pulley size or wheel diameter by simply clicking in the white text box and typing over the existing number and then press enter.  Please note that the numbers entered are in decimal inches, example 3½” = 3.5 (Excel Web App calculator may load slow or not work with older web browsers!)