On May 10, 2019, at 9:34 AM, Michael Gross <ActorMichaelGross@...> wrote:

Johannes, those are, indeed, plastic wheels.  I always install plastic wheels when painting and weathering models.  Among other things, the axles mask the stock truck axle pockets from paint.  The model will eventually have metal .088 semi-scale wheels.
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Michael Gross
On the road - Lake Tahoe, NV