I have a Trek 610 that's been put off for too long. I was thinking about redoing the paint, but this thing needs to be ridden asap. Anyway, it has needle bearings, which don't seem to have very much grease. After I clean them up, would a very light coating of marine bearing grease suffice? I'm also wondering about the BB, which I'm guessing is a cartridge type. With the chain off I can spin it and feel a slight vibration once it reachs a certain point in each revolution. Can I just ride on it for just a little bit? Or do I run into other risks by not taking it apart and relubing it, or replacing it?