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Chain slipping after maintenance - what have I done wrong? (video in description)


Trying to do up an old bike for my brother - I cleaned it and replaced the chain and gear cables, but now the chain slips when riding it (I can't say for sure but I don't think it did this before). When replacing the chain I tried to make sure the new chain had the same number of links as the old one.

Here's a clip showing the issue:

Any suggestions as to what I've done wrong?


  • elbowlohelbowloh Posts: 7,078
    "Video unavailable

    This Video is private"

    does it just need indexing?
    Felt F1 2014
    Felt Z6 2012
    Red Arthur Caygill steel frame
  • Thanks for letting me know elbowloh - hopefully I've fixed the visibility of it now.
  • elbowlohelbowloh Posts: 7,078
    edited October 2020
    Have you routed the chain properly through the derailleur? I've done that before and it was the wrong side of one of the metal "lips".
    Felt F1 2014
    Felt Z6 2012
    Red Arthur Caygill steel frame
  • shortfallshortfall Posts: 3,288
    edited October 2020
    It's a bit hard to tell but it looks like it's slipping on the front chain ring to me. It's not unusual for a new chain to skip on a used cassette due to the different wear rates and it's not inconceivable that in this case that the chainrings that are worn rather than the cassette which may have been previously replaced at some point. It's impossible to say without seeing them or knowing how hard a life they've had though.
  • Tis hard to see, but it looks as the chain/cassette isn’t moving/jumping so it must be the chainring sliping. You have another two chainrings (though they may be as bad), try those. But chances are the small ring that your video shows is worn out and needs replacing and possibly all three need renewing

    Example: Worn teeth on the left

  • Ben6899Ben6899 Posts: 9,574
    Chain ring is cooked.

    Bikes: Donhou DSS4 Custom | Condor Italia RC | Gios Megalite | Dolan Preffisio | Giant Bowery '76
    Flickr:[email protected]/
  • reaperactualreaperactual Posts: 1,092
    edited October 2020
    A new crankset /chainrings and more than likely a new cassette too will fix that problem.
  • superworn chainrings!!! replase ASAP!!
  • It took me ages to get round to fixing the bike - ended up finishing it just before Christmas.

    Thanks for all the replies - they were spot on about needing new chainrings and a new freewheel too - are the old worn parts:

    The bike is running great now.
  • Glad to hear your all sorted out Stygian
    enjoy your cycling :)
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