Actually what I meant was single sided sealed or single shielded versions as my bearing distributor here has the same price on ZZ or 2RS. Just note that with 2RS bearings depending where you get them you might want to change out the grease to a high quality grease. The seals is easily popped and reinstalled. I even seen some to have only a little grease in them especially those cheap FleeceBay ones. I tend to pop the seals and add EP2 grease here before I install them.
Personally I don't see any reason to pay extra for having one side open when I can do it here myself.
And as I said got watch out for those ElCheapo bearings. I just replace a pair of 6204-2RS that was installed a couple years ago that actually was rusting internally so they were not as sealed as claimed glad I only brought 10 from Amazon before I found my bearing distributor.
