Beadlock wheels are illegal in the United States because they do not meet the minimum standards for safety set by the Federal Motor Vehicle Safety Standards (FMVSS). The FMVSS requires that all passenger vehicles have a minimum of two brakes, and beadlock wheels only have one. This means that if you were to use beadlock wheels on your car, you would not be able to stop as quickly or safely as you could with two brakes. Additionally, beadlock wheels can cause your car to lose traction and spin out of control more easily than with two brakes.