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should i re order ?
If you already have them, you might as well use them. In general, I find it improbable that dropping ceramic bearings into mechanisms designed around steel ones will be an improvement over all, particularly on a bicycle where speeds are low, there is no good reason to exclude grease, and most of the bearings are exposed to significant shock loads.
gbj_tester
does tester approve zen ceramic bearings ( 61903 2rs sealed ring bearings for hub bodies )
i know skf and fag are the go to brands but i hurriedly ordered some ( what i thought were skf ) but they turned out to be zen ceramic
should i re order ?