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Any tips
If they have seals, leave them alone. Unless you want that last tenth of a Watt for racing, in which case remove them. In practice, especially in the mostly clean environment of a TT bike, hybrid ceramics in dérailleur pulleys seem to be fine with or without seals as long as they have some sort of shielding as part of the overall design. The first ball-bearing pulleys were much worse protected and also fine, and before that we had bushings which were also fine.
If you want to go full #tartmode at some point in the future, you can probably get full ZrO2 cartridges in the same dimensions for less than £20 each. Won't make any material difference, but the placebo effect is probably worth it 🙂
gbj_tester
Retro_Bastard
These are the ones I've ordered. The description says sealed and ceramic but no more info then that. So as they're Chinese and £80 would that suggest hybrid bearings in regular steel races? Any tips on optimising these like lubing the bearings on these if not full ceramic or removing the seals altogether? I've got some Ludicrous lube for special occasions and i should be able to get hold of some W&S HS grease prep which is meant to be fast in hub bearings and probably more suitable than the ludicrous lube which is designed for chains