Just worn out? Those are original from the bike purchase about nine years ago.

What would need to be replaced? The whole dérailleur or just the jockey part?

I'm really wondering what that metal bump is between the two pulleys... The chain is supposed to actually rub against that? I guess that would line the chain up or keep it taut but... It looks like it's just causing wear, the way it is on my bike.


I was searching for videos, but getting nothing. These looked more interesting though.