What's the reason for abnormal noises under the car?

[FinleyRose]

Abnormal noises under the car may be caused by suspension system noises, constant velocity joint noises, wheel hub bearing noises, exhaust pipe noises, etc. Overview of automobile wheel hubs: The wheel hub (Car-Rim) is the central part of the wheel where the axle is installed, also known as the "wheel rim" or "steel rim". Wheel hubs are prone to accumulating dirt, and if not cleaned for a long time, they may corrode and deform, creating potential safety hazards. Classification of automobile wheel hubs: Wheel hubs can be divided into steel wheel hubs and alloy wheel hubs based on material, each with its own advantages and disadvantages. The main advantage of steel wheel hubs is their simple manufacturing process (generally using casting techniques, while aluminum alloy wheel hubs typically use low-pressure casting processes), relatively low cost, and strong resistance to metal fatigue.