The reason I'm looking at the 500w KT controllers is that the 500w ones with the 9 pin motor connector are more available in my country than the 250w/350w 9 pin versions.Sure, as long as you're not stupid and lug the motor up hills til it slows down to 6 mph and groans. The bike really isn't going to run much faster. The 500W will allow it to accelerate a little better, Many of us change controllers to get a better display. and perhaps a better feeling pedal assist.
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