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  1. lewd_panther on

    Could be the chain is dry, but if it’s actually jumping teeth on the cog itself that’s usually a worn cassette or chainring. Try lubing first since that’s free, then spin it in the stand and watch if the chain skips under load. If it keeps doing it after lube you probably need to replace the cassette.

  2. Stiff links, maybe worn jockey wheel…

    You’d be surprised how many people dont swap they jockey wheels

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