Most bicycles, tricycles and motorcycles have a tubular frame. The front fork (which holds the front wheel) pivots within the head tube . On a motorcycle, the "head tube" is normally called the steering head. On a bicycle the head badge is invariably mounted on the head tube.
Read more about Head Tube: Bearings, Castor Angle, Head Tube Diameters
Famous quotes containing the words head and/or tube:
“It is easy to see that, even in the freedom of early youth, an American girl never quite loses control of herself; she enjoys all permitted pleasures without losing her head about any of them, and her reason never lets the reins go, though it may often seem to let them flap.”
—Alexis de Tocqueville (1805–1859)
“Even crushed against his brother in the Tube the average Englishman pretends desperately that he is alone.”
—Germaine Greer (b. 1939)