The rim in most wheels has the name and logo of the company from which the it was manufactured. Any time you are out buying wheels, check the rim and ascertain that the logo on it is from a recognized manufacturer. If you recognize the logo, the next thing you do is check whether the logo is as you had seen it while doing your research. You can always tell a fake logo from an original one. The fake always has something missing. If it is as you had seen it, then the wheel is a metal alloy.