... damp spring ZF-F4 ELECTRIC MOTORCYCLE belongs to Chongqing New Summit Motor Import & Export Co., Ltd. Which is established in 1994 ... 000 units of electric bikes.As a large-scale professional motorcycle manufacturer, our business involves in the self-research & development ... quality management system certifications. As producing two and three-wheel motorcycle, SUMMIT MOTOR has "ZF", "HUAWIN", "ZF-KY", ...