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If that was me, here is what I would do:
1.) Prime, paint entire rim gunmental (I would airbrush or spraypaint it)
2.) Apply a big piece of masking tape (a solid piece like Tamiya's 40mm or 18mm masking tape) over it, and burnish it into the circle of the rim with a toothpick.
3.) When the masking tape lies nice and flat on the rim, use a sharp X-Acto knife (new blade) and trace the outer edge of the rim, then remove the cut off piece of masking tape.
4.) Now the lip is exposed, paint it chrome with airbrush or spray paint.
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