If it's high-mileage loose-bearing hubs, the cone/race could be shot, though the parts can often be found even for old hubs. If it's sealed-bearing, should be nothing to it for your LBS. If you want to spend more than Deac's 19 cents, Boca Bearings has a pretty good application database for his wares. I'm running Si-N ceramic balls in my C-Record hubs.
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