Here are some common indicators to determine if bicycle bearings need to be replaced or repaired:
Abnormal noise: If you hear unusual noises coming from the bearing area, such as sharp friction sounds, squeaking, or grinding noises, it may indicate a problem with the bearings.
Rough rotation: Bearings should rotate smoothly.  If you feel abnormal resistance, roughness, or any kind of binding sensation during rotation, it may suggest that the bearings need to be replaced or repaired.
Looseness or damage: If you feel any looseness or play, or notice obvious damage, cracks, or missing parts on the bearing's appearance, it may require replacement.
Bearing clearance: Bearings should have proper clearance.  If you feel excessive clearance or no clearance at all, it may indicate bearing wear and the need for replacement.
Vibration or instability: If you experience abnormal vibrations or instability while riding, it may be due to bearing issues.
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