If these are 6001 or similar deep groove radial bearings be very careful not to apply a preload when adjusting the hub.
Preloading is correct and necessary for angular contact bearings like classic cup/cone hubs. But radial bearings are already preloaded and excessive side load will jam the balls against the sides of the tracks, materially shortening the life of the bearing.
Adjust them so that any play at the rim is taken up, and no tighter. If in doubt, a bit loose is better than a hair tight (the opposite of what angular contact bearings want).
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