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:
“I ask whether the mere eating of human flesh so very far exceeds in barbarity that custom which only a few years since was practised in enlightened England:Ma convicted traitor, perhaps a man found guilty of honesty, patriotism, and suchlike heinous crimes, had his head lopped off with a huge axe, his bowels dragged out and thrown into a fire; while his body, carved into four quarters, was with his head exposed upon pikes, and permitted to rot and fester among the public haunts of men!”
—Herman Melville (1819–1891)
“Even crushed against his brother in the Tube the average Englishman pretends desperately that he is alone.”
—Germaine Greer (b. 1939)