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The rim is the "outer edge of a wheel, holding the tire". It makes up the outer circular design of which the inside edge of the tire is mounted on vehicles such as automobiles. For example, on a bicycle wheel the rim is a large hoop attached to the outer ends of the spokes of the wheel that holds the tire and tube. In cross-section, the rim is deep in the center and shallow at the outer edges, thus forming a "U" shape that supports for the bead of the tire casing.In the 1st millennium BC, an iron rim was introduced around the wooden wheels of chariots to improve longevity on rough surfaces.On bicycles, the optimum tire width is approximately twice the rim's internal width (e.g., a 35 mm tire on a rim with an ETRTO 17mm internal width) or one-and-a-half times the rim's external width.[citation needed] Considerable variation outside this range is safe, but very wide tires on a narrow rim can overstress the rim and damage the tire sidewalls, whereas very narrow tires on a wide rim give a hard ride and can result in a high-pressure tire blowing off.

 

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