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How often do you degrease your rear cogs/derailer? And what do you use?
Rear cassette? Not nearly often enough!
The pulleys on the rear derailleur? Usually when the start squeaking or if I'm cleaning the entire bike anyway. I've read conflicting opinions on whether to put any lube inside the little metal cups on the pulleys and have been just cleaning them out (a Q-tip works well) and re-assembling them dry.