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一种兼有摩托车的快捷、又能保持自行车原有的轻便;既能机动、又能脚踏;既安全又节能的“蓝箭牌自行车助力器”,重仅7公斤,可装在任何自行车的后轴
It is a fast and convenient bike that can keep the original lightness of the bicycle; it can be both mobile and pedal; it is both safe and energy-saving, and it can weigh only 7 kilograms and can be mounted on any bicycle. Rear axle