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Testo: <blockquote data-quote="leandro_loi" data-source="post: 7137173" data-attributes="member: 134265">Jobst Brandt. Bicycle Wheel.Page 14. Static Load.For clincher tires (used on most bicycles), air pressure in the tube pushes inward on the bed of the rim while the tire bead pulls outward on the hooked rim edge. These two forces cancel each other exactly; only the effect of the cord angle, as in tubular tires, causes a net inward force. That is, the bead does not pull out as much as it would if the cord angle force were absent, so the inflation force is not entirely cancelled by the bead pulling outward. For a specific tire cross section and cord angle, the constriction of clinchers can be computed by treating them as tubular tires and subtracting the open part of the tire casing.</blockquote>