Thank you all!
Here come the wheels. The construction is very weird and I don't know why the creator designed the wheels like this. There are a lot of areas which could be improved easily and more than once the instructions fooled me. They do not show which side of the parts are up or down, inside or out, and part 62 does not look like in the instructions at all.
Ah well. So here we go.
So far the light grey parts are the ones which should be "chromed". So I painted them with a silver marker.
Parts 56 & 57 are cones but the instructions do not show if the smaller or the bigger end attaches to 55. So I choose the smaller end "up" which was a good idea. Since I had no idea which face would be visible on the finished model I painted both sides of the parts in question.
As you can see I used a small paper strip to glue 56 & 57 together.
The hub caps were straight forward.
However, in the end I saw that the textured side of 59 is best glued down so that it is visible when you turn the assembled cap pieces around. I used a grey felt-tip to paint the back side.
The hub caps are supposed to be glued inside 56-57. This proved to be a big problem since the hole is as big as the cap and the cap had absolutely no area to hold on to. I attached a simple strip of paper to the inside right where 56 meets 55.
The addition now gave the cap some space to lock on.
The tires were pretty easy but as I already mentioned parts 62 look different from the images in the instructions.
Parts 63 do not have to be attached separately. You can glue them directly to 62. Everything fits.
Due to the missing flaps the fit depends solely on the builder's accuracy. If you do not cut out the parts carefully you will get some minor gaps. I filled those up with glue.
61-63 are pushed over the hub cap piece and glued into place.
A view from the back side:
I added a good amount of glue to the inner ring 55 to make sure that the cap is firmly attached.
Finally the tire is closed using another part 62:
This is it. The middle section (part 59) is not attached to the other end of the tire. This contradicts every wheel construction I know and makes the axles highly unstable. Looking at the finished wheels I can say that parts 55 do not need to be painted silver.