TripleD,
I don't hardly think that if one part of the wheel is anodized that the other part would be powder coated.
Try this: get some Aircraft Paint Stripper try it on the lip and see if it removes the coating. If it does then you know it's all powder coated. If not, use some EasyOff oven cleaner(lye) and see if that will take the coating off.
Read this thread also.
MOTORCYCLE POLISHING 101 CLASS IS IN SESSION!
John