The wheel bearings on these machines, should they be shielded or open faced ?

Shielded as in z= steel shield one side, open the other, zz= both sides steel shielded or rs= both sides rubber shielded, no lettering meaning open bearing.

I ask, as I have my bearings out, the back wheel has two sizes of bearing, a 6202 on the brake hub side and a 6302 on the drive side, I am ok with that aspect, but of the bearings, one was an open face bearing and the other was rubber shielded, is this normal, just what faced bearings should be in the wheeel hubs ?

Am going to replace them with SKF bearings anyway, just as soon as I know what faces to get.

Oh, and for others information, the front bearings, both sides are 6202, so you need 3 x 6202 and 1 x 6302 bearings to do a complete bearing job on your bike.