The
stem is the component on a
bicycle that connects the
handlebars to the
steerer tube of the bicycle fork. Sometimes called a
goose neck, a stem's design belongs to either a
quill or
threadless system, and each system is compatible with respective
headset and fork designs:
- Quill: the stem inserts into the steerer tube, which is threaded and does not extend above the headset.
- Threadless: the stem clamps around the steerer tube, which is not threaded and extends above the headset.