Replace a Worn‑Out Bike Chain
Created by Cheli
Step‑by‑step guide to safely remove an old chain and install a new one, ensuring proper length and tension.
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Checklist Items (23)
Gather tools and parts
Collect all necessary tools and replacement chain before starting.
Rag or degreaser
Use a clean rag and a biodegradable degreaser to clean the drivetrain.
Prepare the bike
Position the bike to relieve chain tension and allow easy access.
Shift to smallest chainring and smallest cog
This reduces tension on the chain, making removal easier.
Secure the bike in a workstand or flip upside down
Ensure the bike is stable; protect the saddle and handlebars with a towel if needed.
Release the rear wheel quick‑release or thru‑axle
Loosen the axle to remove the wheel if you prefer more workspace; otherwise keep it installed.
Remove the old chain
Detach the worn chain from the drivetrain.
Open master link (if present)
Use master link pliers to compress the link and slide it apart.
Push out a pin with a chain breaker (if no master link)
Align the chain breaker pin with a chain pin, turn the handle to drive the pin out, then separate the chain.
Clean the drivetrain
Remove grime and old lubricant from chainrings, cassette, and derailleur.
Apply degreaser and scrub
Spray degreaser on chainrings, cassette, and derailleur pulleys; agitate with a brush.
Rinse and dry
Rinse with low‑pressure water (if safe) and wipe dry with a clean rag.
Wipe down surfaces
Ensure all components are free of residue before installing the new chain.
Measure the new chain length
Determine the correct length for the replacement chain.
Shift to largest chainring and largest cog
This gives the maximum chain wrap for reference.
Use old chain as reference or apply the big‑big + 2 links rule
If the old chain is still usable, lay it alongside the new chain and match link count; otherwise, add two links to the big‑big measurement.
Install the new chain
Route the new chain through the drivetrain and connect the ends.
Thread the chain through the rear derailleur
Follow the cage path: upper pulley, lower pulley, then around the chainring side.
Bring the chain ends together on the drive side
Hold the ends so they meet just behind the front chainring.
Connect the chain using a master link or chain breaker pin
If your chain includes a master link, snap it into place; otherwise, insert a new pin with the chain breaker and ensure it is flush.
Adjust tension and check shifting
Verify that the chain runs smoothly and the derailleur is properly set.
Shift through all gears
Cycle through each gear combination to ensure smooth engagement and no skipping.
Adjust the B‑tension screw if needed
Turn the screw to increase or decrease clearance between the chain and derailleur cage.
Check chain slack
Pull the chain upward/downward; there should be slight movement but not excessive sag.
Test ride and finalize
Take a short ride to confirm proper installation, then lubricate and wipe excess.
Ride and check shifting
Ride for a few minutes, shifting through all gears to confirm smooth operation.
Listen for noise or skipping
Pay attention to any unusual sounds that could indicate mis‑installation.
Re‑lubricate and wipe excess
Apply a few drops of chain lube, let it penetrate, then wipe off surplus with a rag.