Knowing how to fit a bike chain is an essential skill for any home mechanic. Chains are one of the consumable parts of your drivetrain and will stretch and wear with use, so you will need to replace it sooner or later.
The steps below are the same whether you ride a mountain bike or a road bike.
How to replace your worn out chain
What you need
- Chain splitter tool (aka: chain breaker)
- Chain checker tool
- Piece of broken spoke
- Quick link pliers
What to do
There are a few exceptions, but most chains from the major manufacturers are compatible with each other's drivetrain components. However, you will need to match the speed of your drivetrain with the speed of your chain — for example a 9-speed drivetrain will require a 9-speed chain.
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Using the chain splitter, push one of the pins out of the lower stretch of chain or undo the quick link if one is installed. Once you've extracted the pin, carefully remove the chain from the bike.
If you've let your chain wear too much, then you may need to replace your cassette at the same time. Read our article on chain wear to learn more.
Shift the rear derailleur into the biggest cog and the front to the biggest chainring. Release the clutch mechanism on your rear derailleur if you have one.
How to care for your chain
How to measure a chain for wear
Chain tools and wear checkers
You can read more at BikeRadar.com
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