How to replace a bike chain

Cycling / Popular

Measure chain wear, size a new chain and fit a quick link.

What coaches agree on

  • Size a new chain by laying it next to the old one, once you've confirmed the old length was correct, and matching them link for link, then cut the new chain to that length.
  • Shift to the smallest chainring and smallest rear cog before you remove the chain - it slackens the chain and makes the job much easier.
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  • Check whether your chain is directional - look for a small arrow or lettering that only appears on one side - and install it facing the correct way.
  • Lock a quick link into place by holding the rear brake and giving the pedal a firm push to snap it fully home.

Common mistakes

  • Mismatching the plate types when lining up old and new chains - a quick link needs both ends to land on an inner plate, while a joining pin needs one inner and one outer end, so getting this backwards throws the length off by a link.
  • Riding a chain well past its wear limit instead of checking it regularly - it lets the chain damage your cassette and chainrings too, and can lead to skipping or even snapping.
Bike Chain Replacement
Beginner

Bike Chain Replacement

Coach's take: Careful, correct, and explains the reasoning at every step - a great reference video.

3.7
Installing a Bike Chain
Beginner

Installing a Bike Chain

Coach's take: A few real shop-mechanic tips in here you won't get from a generic script.

3.5
Fixing A Sagging Bike Chain
Intermediate

Fixing A Sagging Bike Chain

Coach's take: Teaches a smart length-check trick the other how-to videos skip - worth watching even if you are not troubleshooting a sag.

2.6