![]() (880 feet/min) / (Y feet/rev) = Z RPM (880 / 6.81 = 129.3 RPMs for 10-MPH).which is equal to 12.9 for 1-MPHĢ2 inch diameter tire (Pirelli ML75 moped tire on a 20-inch rim) Then we just calculate the number of revolutions needed to travel 880 feet: In one revolution, it travels a distance equal to the circumference of the wheel, which is Pi times the diameter: (10 mph x 5280 feet/mile) / 60 min per hr = 880 feet per min, so. If you want to use a tire with an odd outside diameter (such as a fat moped tire on a 20-inch bicycle wheel, which would typically be 22-inches), you go to the tire selection and click on “other", then enter a number of the tire outside diameter into the next square in inches (decimals allowed, 1/4-inch is 0.25).įor instance, if using a custom tire with an outside diameter of 60-centimeters, you would use an online conversion calculator, then enter the result of 23.62 (inches) into the cadence calculator Other-> wheel (using 1:1 gears) to find the top-speed/rpm result. This link is a pedal cadence calculator (thanks, Drunkskunk), but if the sprocket and chainring tooth-count numbers entered are the same (1:1) then the pedal-cadence will be the same as the rear-wheel rpm. I have compiled this chart to make the process a little easier. By selecting the lowest top speed that can satisfy your performance needs, torque will be maximized across the resulting rpm band.įrom reading here, most builders have settled on wheel diameter and top speed desired when they begin pondering motor Kv selection, voltage to be used, and gear-down options. When contemplating a non-hub motor, the maximum motor RPM target and gearing equations can get complex.
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