What causes damage to a wheel hub?

Wheel hub damage is mainly caused by a combination of mechanical impact, overloading, material defects, driving habits, and environmental factors. Such instantaneous impact forces may result in structural fractures in aluminum alloy hubs, while steel hubs are prone to plastic deformation. Long-term overloading causes hubs to bear radial loads exceeding design standards, leading to metal fatigue and accelerated bearing wear, which is particularly noticeable in heavy-duty vehicles traveling on rough roads. Abnormal tyre pressure (e.g., tyre pressure 30% or more below the standard value) alters the force distribution, causing concentrated stress on the hub edges. Manufacturing defects such as internal porosity in aluminum alloy hubs or uneven heat treatment reduce impact resistance, and such issues can be detected through crack testing during regular inspections. The high-salt environment in coastal areas accelerates the rusting of steel hubs, while frequent sudden acceleration or braking transmits additional torque to the hub joint through the transmission system. It is best to check the hub dynamic balance every 5,000 kilometres, use a torque wrench when replacing tyres to ensure the bolt tightening force is within the manufacturer's specified range (usually 80-120Nm), and avoid directly rinsing high-temperature hubs with a high-pressure water gun to prevent material embrittlement due to sudden cooling.