The vast majority of aluminum alloy automobile wheels are now cast, despite the heat treatment, the residual stress must still exist. If it is an even number, it is easy to produce greater stress on a pair of spokes at 180 degrees, which exceeds the tensile and shear strength, and then breaks. If it is an odd number of spokes, the stress and deformation can be transferred to more spokes, which plays an average role. If the three frames are too far apart, the force is still concentrated, and the five spokes are ideal. Also because of this reason, the ten-spoke wheels are generally arranged in a double five-spoke manner.