I have an idea to rectifying the electric scooty or bike,electric ev are run through bettry or motor.The motors are attached with the back wheel no need of any kind of special space for motor. don't need chain socket for run the vechile. Just exclerat and the motors help the wheel to moving forward or backward it's same thing we used front of the wheel which converts into 2*2 to generate the double speed of the E.V vechile. It's means the motors are used in front of wheel,it's means we have two motor first us not working 2nd is also used it's called backup or daily used .With that help the customer not facing the problem.
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