GM patents hybrid metal-composite wheels

General Motors has filed a patent application for wheels made from a combination of metal and composite material, which the automaker claims could reduce weight and materials cost. Most production-car wheels are made from aluminum or steel, and are usually cast or forged as a single piece. The patent application, which was published by the United…General Motors has filed a patent application for wheels made from a combination of metal and composite material, which the automaker claims could reduce weight and materials cost. Most production-car wheels are made from aluminum or steel, and are usually cast or forged as a single piece. The patent application, which was published by the United…