Rim (wheel)
Outer part of a wheel on which the tire is mounted / From Wikipedia, the free encyclopedia
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For other uses, see Rim.
The rim is the "outer edge of a wheel, holding the tire".[1] It makes up the outer circular design of the wheel on which the inside edge of the tire is mounted on vehicles such as automobiles.[2] 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.[3] In cross-section, the rim is deep in the center and shallow at the outer edges, thus forming a "U" shape that supports the bead of the tire casing.[4]
In the 1st millennium BC, an iron rim was introduced around the wooden wheels of chariots to improve longevity on rough surfaces.[5]