I am not the most knowledgeable when it comes to bikes so please bear with me. I have a Claud Butler and after fixing a puncture I decided to ride it. As I was riding, I could hear a sort of rattling whilst in the low gears, but then when I went up in gears, I noticed that the sound continued but also it felt like the chain was slipping. After inspecting it later, I believe it has something to do with the rear derailleur, as every now and then it would spring forward a little and then return to just the rattling sound.

What could be causing this problem, and what can be done to fix it?

  • what did you do when you fixed the puncture? did that coincide with the start of the problems?
    – PeteH
    Jul 27, 2014 at 11:54
  • I moved the derailleur so that I could get the wheel out and take the chain off
    – Jordan
    Jul 27, 2014 at 11:58
  • Did you actually take the chain off the bike? (You'd need a tool to do this.)
    – PeteH
    Jul 27, 2014 at 12:05
  • No, I mean I took the chain of the crank.
    – Jordan
    Jul 27, 2014 at 12:11
  • 1
    @Jordan, could you post an image please? That could just be a sticky link caused by a dirty chain, but it's possible the chain became damaged when you changed your tyre. Jul 27, 2014 at 13:22

1 Answer 1


The problem you are describing, sounds like the chain is either trying to climb gears or drop gears. This is caused by incorrect cable tension on your derailleur.

While riding the bike, watch (or to be safe, have someone else watch) your rear sprocket and see if the chain is trying to climb up to the next bigger gear, or drop down the the next smallest gear. If either is the case, you can attempt to correct this yourself by making minor adjustments to the derailleur cable tension, then riding to test if the behavior is improving.

Use the derailleur adjustment barrel on the derailleur [see image] (or there is often one on the shiftier on the handlebar as well). If the chain is trying to climb, loosen tension on the cable by turning the barrel clockwise, if dropping, increase tension by turning the barrel counter clockwise. Make minor adjustments ( 1/8 to 1/4 turn at a time).

derailleur adjustment barrell

Since you are not that familiar with bicycles, you could mark where you start, so you can return to that point if this does not correct your issue. The adjustment shouldn't require more than a couple full turns at best.

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