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Hi. I've been told that full ceramic jockey wheel bearings should be left dry but it just seems "wrong" to me- what do you guys think?
Thanks
Kes
 

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If they are actually all ceramic, they need no lubricant. The overwhelming majority of stuff sold to cyclists are not all ceramic, though--they are steel races with ceramic balls. Short answer: because they run with little-to-no heat, and have a low friction coefficient between the balls/races (those two points are related), they don't require lubricant.

They should still be periodically cleaned, though.
 
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