| 摘要 |
The wheel comprises an inner hub part 11 and an integral radially outer part 12 and has a tyre structure comprising an inner ring 21 of relatively soft material and an outer shell 22 of relatively hard material which surrounds the ring 21 and the part 12. The tyre is integrally formed on the parts 11, 12. At the juncture of the parts 11, 12, holes 13 are filled by the outer shell material. The part 12 may have additional holes filled by the inner ring material.
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