I decided to overhaul the hubs on my road bike (Trek 1000C). The front has pitted cones, but the races looked good, so I'm just replacing the cones and bearings. On the rear everything looks good (bearings, races, cones). While I have the rear apart, should I go ahead and replace the bearings? What's the consensus on replacing bearing that show no signs of problems? I have the bearings. They're cheap, so that's not the problem. Do bearings "take a seat" to the cones & races (like brake pads)? Meaning that the new ones might loosen up after a few hundred miles.