Compared with common aluminum hubs,ordinary steel hubs have good toughness and poor hardness.Aluminum hubs,on the contrary,have good hardness but poor toughness.Therefore,the driver will find that after the potholes on the road,the steel hub does not change,and it will start to shake at a speed close to 100km/hr.Because it is stamped and the contour and mass weight are not accurate,it is inevitable.Causes unbalanced moment of inertia and jitter.
