| 摘要 |
The wheel rim (1), consisting of side walls and upper and lower transverse walls with holes (25) at regular intervals for spoke fastenings, has the lower transverse wall and side walls made with a nominal thickness in the zone (26, 27) of the holes, reducing progressively in thickness between the holes. The reduction in rim wall thickness can be achieved by a machining operation to create a median zone (29a) with a minimal thickness of 0.5 mm, and transitional zones (29b, 29c) on either side of it having a radius of curvature of 100 mm.
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