| 摘要 |
A rim construction for mounting a tire which has a base member in which a groove or gutter has been machined to a fine tolerance. A lock ring with a semicircular projection is formed by cold extruding steel to a matching fine tolerance of the gutter so that when the lock ring semicircular portion or projection is place in the gutter, uniform maximum engagement occurs between the gutter surface and the semicircular lock ring projection surface.
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