Headset There are 23 products.

Headset
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 the bicycle frame itself. The short 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. Traditional threaded headsets fit forks with threaded steerers. The top race screws onto the steerer, and a locknut screws on after it to secure it. There is normally a keyed washer between the top race and the locknut for extra security. In addition to the keyed washer, there may also be one or more spacer washers. Threadless headsets used on many newer bikes (since the 1990s) fit forks with unthreaded steerers and use a clamp or collar to secure the top race. Usually, the handlebar stem does double duty as this clamp or collar. The nominal size of all headsets is based on the outside diameter of the fork steerer. This is a source of confusion, because the steerer is not visible on an assembled bicycle. The steerer is enclosed inside the frame's head tube. In the case of a bicycle with a traditional quill/expander/wedge type stem, the stem shaft will be 1/8" smaller than the steerer. Sometimes people measure the stem diameter and assume, incorrectly, that this is the size headset they have. The vast majority of bikes with threaded headsets use the 1 inch size. A sizable minority uses the 1 1/8 inch size. Other sizes are generally quite rare.

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