the best I can figure the way to determine range is .... battery ah divided by amp draw of the engine = time (engine will run) mph x time= range. more or less.

motor size is usually in watts ie 250 watt motor engine watt = amp x volts ie 250 watts is 24 volts 10 amp draw...

a 250 watt 24 volt motor will draw ten amps of power from a battery... A ten amp hour batter will last 1 hr. If your bike goes 20mph.. your range is approx 20 miles...

except a lot of things enter into it like how much you run at full throttle. bike will get less mph with more weight so lots and lots of variables.

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