Gear ratio to track speed September 14, 2022 11:59PM
Can anybody provide the formula/equation there is to figure out track speed by knowing ring n pinion tooth count, trans gear tooth count, constant mesh, etc. ?? I don't question the math of Carl at Atlas at all, but just trying to do my homework b4 spending the money on the wrong gear sets.
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Re: Gear ratio to track speed September 15, 2022 01:07AM
You could figure wheel speed, but track speed will be hard to do. You would have to know your % of slip and that will change depending on track conditions etc.
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Re: Gear ratio to track speed September 15, 2022 01:08AM
Engine RPM divided by Ratio, times tire circumference, times 60, divided by 5280 equals MPH
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Re: Gear ratio to track speed September 15, 2022 01:50AM
Tire circumference measured in feet*
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Re: Gear ratio to track speed September 20, 2022 05:00AM
Can someone give a full example of how they found their mph with the above equation?
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Re: Gear ratio to track speed September 20, 2022 05:49AM
Example with Mini Rod:

8000 RPM / 11:1 overall ratio x 138 inch tire circumference / 12 inches per foot x 60 minutes per hour / 5280 feet per mile = 95 miles per hour

You just need to make sure all your units cancel out to get miles per hour in the end.
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