The wheel I posted the cross-section of, is this type:

(Pictures of model parts are easier to find than of the real thing, for some reason.) It also existed without the lightening holes around the rim. The ones on your model appear to be this type:

Those, like Allen said, are entirely steel, no rubber involved.

(Pictures of model parts are easier to find than of the real thing, for some reason.) It also existed without the lightening holes around the rim. The ones on your model appear to be this type:

Those, like Allen said, are entirely steel, no rubber involved.
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