Front Knuckle & wheel hub

The knuckle, also known as a steering knuckle or wheel bearing housing, typically consists of a spindle, a hub, and bearings that allow the wheel to rotate smoothly. The knuckle also houses the brake caliper and rotor, and provides mounting points for the suspension components such as the upper and lower control arms, steering tie rods, and shock absorbers.

In summary, the knuckle in a car is an important component of the suspension and steering system, allowing the wheels to rotate and providing a connection between the wheels and the chassis.

The wheel hub is an essential component of a car's wheel assembly. It is a cylindrical metal component that is located at the center of the wheel and supports the weight of the vehicle while allowing the wheel to rotate smoothly.

The main function of the wheel hub is to provide a mounting point for the wheel and tire assembly. The hub typically has a set of threaded studs that extend outward, allowing the wheel to be bolted securely in place. Additionally, the hub contains a set of bearings that allow the wheel to rotate freely on its axis. The hub may also contain other components, such as a wheel speed sensor, depending on the specific design of the car.