Does any one know if the Spun Aluminum wheels from an 02, 03 SERK and available still in the P&A catalogue are solid centers or two discs riveted together ? It's obvious they have rivets, but I was thinking those hold the center section to the rim. As to the balance question, I was thinking of checking a Speed shop to see if they have the Balance Master balancers that Drag racers put on the brake rotors of their wheels to actively balance their wheels.
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It is two discs riveted together with a layer of silicone between them. Trust me, I know because I had a new one engraved, then tried to have it chromed, but couldn't. Two specialty chrome shops tried, and both of them said that they could not chrome it because they could not get a "charge" on it. In the end, I had it repolished and powdercoated clear. Attached is a photo of the finished product. Looks as good as chrome, IMO.