I'm with zx6rballa they are a pain to keep clean. I polished the rims on a GSX-R I had and had to clean them all the time. I have a RGV250 and I had the rims powdercoated and let me tell you that is the way to go. They are easier to clean than stock. And look better.
The one major thing that has keept me from polishing anything on my bike (except with wax) is the fact that the manufacturer makes it just strong enough. One of the big things is making the lightest bike possible. They do this in a bunch of ways, one of which is making the parts as thin as they can safely make them. This also saves them a lot of money. So every time someone takes a can of metal polish to their bike's wheels or frame they are making those peices thinner and thinner. Which makes those parts weaker. That's why I haven't polished the frame or wheels. No don't get me wrong you could more then likely do this safely for years, depending on how often you polished them. But the way I see it is why take the chance, that and it's easier to wash it and hose it off then to polish it clean.
I was never a fan of polising large items on a bike like frames, wheels, etc. IMO, polised bits should be small stuff like hangers and brackets. Just enough to accentuate the bike. More than that and it quickly becomes gaudy.
Oh, yeah, it's a PITA to keep shiny, too.
Cheers, Lee S.
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