unijuul said:The 2RS means that the bearings are totally waterproof (I think), and
probably better than the Z bearings with metals on each side.
RS means rubber (or plastic) shield. Z means metal shield. 2RS means
two rubber (or plastic) shields, one on each side of the bearing. ZZ
means two metal shields, one on each side of the bearing.
The RS shields are not waterproof or even water resistant. Water and
grime can (and will) still get in. Rubbing grease on the outside of
the seals around where the edge of the seal meets up with the bearing
race will seal them up a little better and keep the inside of the
bearing a little bit cleaner and a little bit dryer. When that grease
gets dirty wipe it away and apply new grease outside the bearing. You
need to use thick grease for that.
The problem with the Z shields is that they have crevices around the
edge where the metal is bent to fit in the bearing races. Those
crevices hold dirt and allow more dirt and water into the bearing than
RS shields. Z shields are also more vulnerable to being bent and
ruining the bearing. The advantage with Z shields is that they have
less rolling resistance so they roll smoother.
I use RS bearings for the hub for outdoor unicycles. Z bearings are
good for indoor freestyle unicycles. For pedals I use what I can get.
--
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