The advancement of tire technology has become the driving force for development and competition. Recently, according to the "European Rubber Journal" report, the research funding of major companies in the world generally accounted for 3% to 6% of their sales; in 2010, the world's major tire manufacturing companies spent approximately US$4.97 billion on scientific research expenses. Among them, the R&D expenditures of China, Bridgestone, Michelin, Sumitomo, Pirelli, and Hankook accounted for more than 3% of the company's sales, of which mainland China’s R&D expenditure was the largest, reaching 5.6%, and Michelin and Bridgestone were 3%. Among them, mainland, Bridgestone, Michelin, Sumitomo, Pirelli, Hankook, and Yokohama companies spent Rmb1.9211 billion, $968.9 million, $721.9 million, $212.9 million, $198.3 million, $175.2 million, and 1.471. One hundred million U.S. dollars. Four Wheel Electric Vehicle,Mini Four Wheel Car,4 Wheel Electric Car,4 Wheel Electric Vehicle Xuzhou Hengshang Mechanical and Electrical Co., Ltd. , https://www.hengshangtricycle.com