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Ah, well, see....

When you drive the car, the wheel spins. It is attached through a round thing, called a bearing, to a rigid object called a spindle or a knuckle. The spindle has to be able to move up and down to allow for bumps in the road and if it's a front wheel (or rear wheel with 4 wheel steering) it has to be able to turn for steering.

The spindle is attached to the vehicle in at least three points to hold it steady. An upper control arm attaches to the spindle at the top of the spindle and keeps if from moving in a left/right direction. On some (but not all) vehicles it can also keep it from moving forward/backward and can push the spindle down and car up. It is usually attached to the spindle via a ball joint.

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17y ago

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