bandsaw lower guide bearings?

Just picked up a second band saw which has double roller bearing guides top and bottom. In another thread later I'll talk about WHICH band saw I bought so that some here can lose their dentures in disgust - but that is for a later story!

The bearings are all 6202Z which are shielded bearings - a strange choice I think. The uppers were fine, but the lowers were in various states of tight condition and in the rear single bearings case frozen solid!

I was thinking of replacing all of the bearings under the table with 2RS sealed bearings. Any reason why this would not be a good idea - presumably the manufacturer had a reason for using shielded bearings but I can't think what it would be?

thanks.

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bandsaw lower guide bearings?