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Thanks for the detailed advice, I think I'll just take them to the shop -- the bearings should be fine, since the bike rolled perfectly and I thought it must be the chain making the noises, then I took it off and it turned out that the hub is making the grinding sounds, hopefully re-greasing them will do the trick and doing it in the shop will be most likely be cheaper than to buy a tube full of decent bearing grease :) and I only have two adjustable wrenches -- maybe somebody who knows what they're doing could open the hub with just that, but not me
user57774
hugo7
Bearings are cheap, so you might as well replace them anyway.
When I get a second-hand pair of wheels, I'll change them as a matter of course: you don't know what sort of life they've had.
When you've got the hub open, run a ball point pen around the bearing track: you'll be able to feel any pitting more easily than you can see it.