Why has my bike chain goes loose?

Why does my bike chain keep loosening?

Your chain might simply be too old or can stretch over time. When this occurs you need to replace it. Consider that your loose chain also may be due to operator error. Exceeding the recommended gear range for the rear derailleur on your bike may lead to a droopy chain when you ride in these gears.

What happens if your bike chain is too loose?

The major symptoms of a loose chain include chain teeth skipping over the sprockets, uneven transmission of power to the wheel leading to jerky wheel movements, chain lash and the chain slapping the swindle arm, and in the final case, chain coming off the sprocket.

Why does my bike chain go slack?

Check your jockey wheels as well. if they are not turning freely or the chain has come off one then it will make the chain go slack when you stop pedalling. The most likely cause though is the freehub or freewheel being sticky as said.

What causes a dropped chain?

It might be that the chain is worn, has a stiff or bent link, or has become clogged up with dirt. A visual inspection while turning the cranks should reveal if there’s a problem here. The chainring, or a chainring tooth, could be bent.

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Why does a chain stretch in service?

Another highly significant factor in chain stretch is the accumulation of dirt particles between parts of a chain. These particles form a paste with existing petrochemical lubricants, and they will cause pins, rollers, and bushings to lose material rapidly, again resulting in an overall elongation of the whole chain.

Is a bike chain supposed to be loose?

It should be tight enough that it only allows you to move it up and down about one inch. If it is sagging or much looser than that, you need to tighten that chain up.

Why does my chain fall off when I stop pedaling?

If your chain is getting slack on top when you stop pedalling or backpedal, then the problem is in your freehub (or freewheel, whichever you have), a dirty freehub will cause all the problems you’ve listed, even on a brand new bike.

Why does my bike chain fall off when I pedal backwards?

Stiff Link In Chain

Stiff links in a chain can cause it to fall off the chainwheel when pedaling backwards because they are not moving as smoothly as they should be. The chain mechanisms on a bike need to run like a well-oiled machine. The movement of the chain needs to be smooth and any stiff links can disrupt this.

Why does my chain sag when I pedal backwards?

When you pedal backwards, you pull on the bottom of the chain which pulls the derailleur forward. That creates chain slack. Some of that chain slack shows up on the top half of the chain as the chain links get dumped off the front chainring into space on the way backwards.

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