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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
    Commented Jul 22, 2020 at 15:43
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    Did you repin the chain or use a quick link to reconnect the chain?
    – mikes
    Commented Jul 22, 2020 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. Commented Jul 22, 2020 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? Commented Jul 22, 2020 at 16:53
  • I replaced the chain also. I used a special link to connect it
    – Paul
    Commented Jul 22, 2020 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
    Commented Jul 23, 2020 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
    Commented Jul 23, 2020 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. Commented Jul 23, 2020 at 14:12

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