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I am trying to figure out why my chain is catching with each revolution. You can see it in this short video

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    It looks like one link of your chain is stiff and slightly raised causing it to catch the jockey wheel on each rotation. Do you keep your chain well maintained? – Dan K Jul 22 '20 at 15:43
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    Did you repin the chain or use a quick link to reconnect the chain? – mikes Jul 22 '20 at 15:56
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    my chain is catching with each revolution Each revolution of what, exactly? It's not the wheel/cassette. It looks more like the derailleur isn't properly adjusted and the chain is trying to shift to the larger cog. – Andrew Henle Jul 22 '20 at 16:26
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    Can you give us more info about the derailleur change? What was the old one, what is the new one? – Argenti Apparatus Jul 22 '20 at 16:53
  • I replaced the chain also. I used a special link to connect it – Paul Jul 22 '20 at 18:24
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The chain is constantly catching the derailleur, every few links or so. It's not a stiff link in the chain - unless the chain is made of stiff links. The chain does not look like it riding onto the next largest sprocket either.

The derailleur is the new factor and it looks like the chain is catching in the cage. I'd check the jockey wheels are rotating freely. I'm guessing one jockey wheel is catching at some point in its rotation.

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    There could be something stuck to the upper pulley preventing it from engaging the chain, or the bushing might be so gunked up it resists spinning intermittently. It is that upper pulley though for sure. – bradly Jul 23 '20 at 12:44
  • Looking at it again it seems like the whole cage for the derailleur jockey wheels is bent. I am concerned about snapping it off it I try to straighten it. Any ideas? – Paul Jul 23 '20 at 14:05
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    @Paul re-looking at the pictures yes the chain is exiting the cage at an angle. The hanger may be bent rather than the cage. – Argenti Apparatus Jul 23 '20 at 14:12

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