Wheel of classification and their characteristics, also known as wheel rim, the main distinction in its class materials and manufacturing processes are different. From the manufacturing process, the common is divided into two types of cast wheels, its simple fabrication process, the molten metal is poured into the mold in the production of wheels and molding, wheel features such as: modeling diverse low manufacturing cost, relatively cheap, but the steel is low and the weight of its big weakness, and if the wheels of lightweight steel without special requirements, then, sufficient to meet the daily needs of a variety of uses. Another is the forging wheel, its production process is to use one piece after a high-pressure press forming one, which is characterized by relatively casting wheel has higher strength and better steel, and lighter weight, are often subject to some high performance requirements of the consumers to choose, of course, the price will increase and improve with the quality, forged wheels is that due to the inadequacy of the manufacturing process constraints, the relative can make the style which is not what a rich cast wheels. Distinguished from the material up can be divided into aluminum, titanium or other alloys and carbon fiber material, the material is to be continuously optimized to produce lighter, higher strength of the wheel. After a brief introduction, I believe we have modified the role of the wheel and how to select a suitable wheel has some understanding.