You already have a 47t rear with that 14 front ? Might as well go down to 13 front. Each front tooth difference is equal to 3 teeth in the rear.
This will officially be the lowest geared bike I know of, at 90kph the motor will be maxed out on the rpms. Sorry just can't figure this one out. I've always noticed when something is geared too low, it makes first gear worthless so you have to shift right away,and then again, which is slower takeoff than proper gearing.
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