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Retro_Bastard
onyerbike
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 🙂