use an aluminium file then re-polish and laquer. Mine were kerbed like that the whole way round it really doesnt take very long to file it out then smooth with sandpaper.
not sure on that but to get it smooth you will need to have the tyre off, it wont rub down as the kerbing is quite deep so file it out then finish with sandpaper.
I have no idea how to get that polished finish though lol
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