Do this; spray some WD 40 or similar light duty lubricant completely around the lip of the hubcap. Repeat the test and see if the noise is mitigated.
Here is why I say that, there is a thread in the Solera subforum, that was posted a while back, that showed the riveted anchor points that hold the cap to the rim, exhibiting failure do to wear movement. Not sure if that is your noise issue, but its worth investigation. Just sayin'
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