Quote:
Originally Posted by nookandcrannycar
I could tell that when I first looked at the one I bought from CTScott, and when I saw the picture Bronsin posted of his recent accident that showed the driver side front rim  . What I was really wondering is what causes that....driving in the rain in certain (colder?) climates at specific times of the year?.......driving on roads that have been treated with particular chemicals?....lots of driving in areas with particular types of pollution?....and....a thought that JUST popped into my head -- namely driving for extended periods without wheel covers on the car....This hasn't happened with my OEM steelies (no circles). The existence of the circles doesn't worry me at all. I've just always had a fairly well developed sense of curiosity...always asking why  .
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now that you mention it, my steelies that don't have hub caps on them are rust free. I just assumed it was from salt and sand from the road surface sandblasting the parts of the wheel that weren't covered by the hubcap. Now I'm unsure.