I think it's a rather common mistake.. My tire was making noise just like a worn bearing. Not knowing how to test the bearing, I replaced it, and the noise was still there. Only then I tested the removed bearing by hand and it was perfectly smooth. Went to replace the tire and the noise went away. Tires make strange noises sometimes, especially when old or with wear to them.
One small thing, if hammering to remove a bearing, we cannot reuse it because the plate where the wheel is secured on will be slightly bent, and the wheel lugs will loosen up while driving. I warmly recommend using a strong 3 arm puller anyway, hammering out an original bearing is quite a hard job.
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