I’m just an ordinary builder who struggles with, among other things, old AMT kits, but this is how I do it to be able to paint deep rims. Flat colors are easier, thin the paint and paint a few thin coats with a brush and clear coat last. Mount the rim on a tothpick and rotate the rim against the brush. If you must use an airbrush, pant the rim in steps, roll an piece of paper lika a tube 2 mm smaler than the rim and spray, the tube may not touch the rim, a day later: cut a paper disk 2 mm smaler than the rim, put it om the center and spray, last spray the rim edge.
I some times paint the wheel bolts after the first layer by hand brush and then paint the rim colour around the bolts if it is an old not so sharp kit.
So, I hope that Google translator dis the job..