The bearings aren't having issues just wanted some upgraded ones that would last a long time preferably stainless. Before I put the wheels to use I wanted to replace the Chinese ones. The tube in the middle of the bearings seems to be a piece of seamed steel tubing though.
as long as theres a tube inside between the bearings, theres nothing to worry about.
well now....
to reduce friction slightly, when you get your 2RS, rip the inner seal off. thats all it means. 2 Radial Seals.
with a motor on there, sealed bearings are fine, but for pedalling...man, bikes have had unsealed bearings since...well, ever... just a dust shield suffices. too much drag with sealed bearings.
anyway. bearings come in grades, ABEC series. 1 is cheap and nasty. 11 is damn high quality (if its genuine abec11... not an ebay special, or the brand name.). its just a code for limits, tolerances, eccentricity.
then theres a clearance code. N2 is normal, and theres a few others...super tight fit to loose. you can ignore that nonsense, but you did say you want to upgrade...
sooooo....
you want GENUINE abec...hmmm...they only stock 7.... abec7? not ebay "abec13", but real abec7?
take a look at the price.
https://bearingsdirect.com/ball-bea...0tbr12p4-super-precision-ball-bearing-10x30x9
thats unsealed. open both sides.
i shall keep looking...
no luck so far.
i could only find a quote request for an abec 9 6200 series bearing... meaning...its expensive. really expensive.
how about ceramic? no lubrication, no grease, no grit...
china doesnt believe in abec numbers...
https://www.ebay.com/itm/6200-Full-...643561&hash=item1c77007756:g:LuEAAMXQDfdRss1k
neither does america.
https://www.ebay.com/itm/6200-Full-...777?_trksid=p2349526.m4383.l4275.c10#viTabs_0
maybe its just an ebay thing?
https://www.ebay.com/itm/6200-Full-...145826?hash=item53fdab4622:g:aKIAAMXQUmFSfSbh
i would possibly avoid those last type. being ceramic, they have to get all those balls in there somehow. notice the little gap on the inner race? theres a chance of balls falling out. though they shouldnt if its all preloaded and tightened up correctly (hence why you have a tube between the inner races...)
another option is angular contact bearings...which are basically the standard cup and cone bearings used on bike wheels for a century or more....
some of them get pretty pricey too!
just buy some standard plain old 6200 bearings from whoever stocks them nearby...skf or nachi are reputable brands.
or just put up with what you got because sadly...you aint going to notice any difference!