A protective cage for a motorcycle has a member with a bottom and two side portions. The two side portions are spaced apart from each other so as to receive the motorcycle. The side portions are coupled to the sides of the motorcycle frame at coupling points. The cage provides a low profile protective barrier between the engine and the ground when the motorcycle is on its side and does not interfere with the rider who wants to perform stunts on the motorcycle. At least one of the coupling points on each side is provided with a projection, which projection has a replaceable cap.