entire weight of the vehicle and even be used as a jack point to change a tire. They are not called Nerf Bars any more and instead are called Sliders, Rock Bars, or another variation of the two. Hot rod application of the nerf bar The hot rod world will sometimes use a much smaller version of a racing nerf bar. It may be only about 6 inches tall and utilized in the front and rear of a hot rod in place of the traditional bumper. The hot rod nerf bar is attached to the ends of the frame rails and typically chromed. Hot rod nerf bars provide little protection and typically do not qualify as a bumper in most states. References Automotive body parts