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    heya, why is my derailleur skipping and how would i be able to fix it?

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    8 Comments

    1. -ImMoral- on

      Most likely worn teeth on the jockey wheel, repair by replacing the jockey wheel. It is held on with one svrew and a new one costs next to nothing.

    2. UseThEreDdiTapP on

      Try individually moving the links of the chain and see how freely it moves (or doesn’t). It looks like it is very stiff in places.

      Also, that pulley looks really worn. Both too little teeth and bushing slop could lead to the chain not properly following the pulley

    4. Michael_of_Derry on

      It looks like a 6 speed derailleur. What is the model? Not sure how well it would work with a chain for 8 speed.

    7. twothirtyintheam on

      New chain + old drivetrain = skipping chain most of the time.

      The old chain was almost certainly stretched and worn well beyond “spec”. This isn’t uncommon, and everything else in the drivetrain wears at the same rate as the chain. So the whole worn drivetrain will work together for a lot longer than you’d think. The problem comes when you replace any single part of the worn drivetrain instead of replacing all the worn parts at the same time.

      The new chain isn’t stretched for example, but the teeth on all the gears are worn to accommodate the old stretched chain, so the worn gear teeth won’t line up quite right with the holes in a new unstretched chain. That causes chain skip like you’re seeing.

      Short term you can probably reinstall the old chain and have everything work again if you need a working bike until the other new parts can be sourced (assuming the old chain didn’t just break/fail and the drivetrain wasn’t skipping before you replaced the chain too), but long term you’ll likely have to replace most/all of the drivetrain parts that have teeth along with the chain to have it ride right again.

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