A motor vehicle’s steering knuckle is a component which contains the wheel hub or spindle and attaches to the suspension mechanism through a ball joint. It plays an integral role as the pivotal point of the suspension and steering system. On cars with a conventional suspension system, the spindle of the steering knuckle locates and provides support to the inner and outer wheel bearings. There are various types of steering knuckle, which come in a range of different shapes and sizes. However, the two main designs can be divided into those that are accompanied by a hub and those that come with a spindle.

The steering knuckle plays an important part in the steering and suspension system of a modern motor vehicle. If it becomes worn or is damaged there is likely to be immediate, discernible evidence. This normally takes the form of damage to the front tyres, which is exhibited by uneven wear.

Defective steering geometry caused by a damaged steering knuckle assembly adversely impacts on the steering and suspension of the car and may have safety implications. The system should be inspected immediately and the damaged part replaced. Failure to do so may result in additional damage to the vehicle’s suspension and steering systems.