My rear Shimano hub on my Specialized Epic wasn't turning very well, so I decided to take the cassette off and see if I could address the problem. I've never worked on hubs before, so I'm in over my head from the start. Anyway, after getting everything off, I notice that the bearings on one side (the cassette side) are really dirty and black, but the bearings on the brake rotor side are still pretty clean. Is that normal?
Also, I cleaned up the bearings and they all look shiny now, but should I buy new ones instead or is it ok to put the old ones back in? (I'm in a bit of a holding pattern right now because I don't have the right lube for repacking the bearings.)
Any other helpful tips for repacking the bearings and putting the axle/hub back together? Thanks.