engwe m20 electric bike 20 4 0 fat tires 750w brushless motor 45km h max speed 48v 13ah battery 75km range double disc brake shimano 7 speed gears dual shock systems green
engwe m20 electric bike 20 4 0 fat tires 750w brushless motor 45km h max speed 48v 13ah battery 75km range double disc brake shimano 7 speed gears dual shock systems green