Headset

The headset is the set of components on a bicycle that provides a rotatable interface between the bicycle fork and the head tube of a bicycle frame. The tube through which the steerer of the fork passes is called the head tube. A typical headset consists of two cups that are pressed into the top and bottom of the headtube.

Inside the two cups are bearings which provide a low friction contact between the bearing cup and the steerer.

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Source: Wikipedia · Image: Wikimedia Commons · CC BY-SA 2.5

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