Bike Chain & Drivetrain
The chain is the fastest-wearing part on a bicycle, and the one whose neglect costs the most. A chain replaced on time is cheap; a chain left too long takes the cassette and often the chainrings with it.
These guides cover the full life of a chain — cleaning, lubricating, measuring wear, shortening, joining and replacing — plus the cassette it runs on and the dropped-chain fixes everyone needs eventually.
What you'll learn
- Clean a chain properly, on or off the bike, without wrecking your brakes
- Lubricate at the right interval for your conditions and lube type
- Measure chain wear and know the replacement threshold for your drivetrain
- Remove, shorten and rejoin a chain with a quick link or a chain tool
- Repair a snapped chain at the roadside well enough to ride home
- Get a dropped chain back on, and stop it happening again
Guides in this topic
- How to Fix a Bike Chain
Fix a broken, stiff, skipping or jammed bike chain — including the roadside repairs that get you home when the chain has snapped mid-ride.
- How to Remove a Bike Chain
Take a bike chain off with a chain tool or a quick link, without losing your chain length or weakening the link you push back together.
- How to Clean a Bike Chain Properly
Clean a bike chain on or off the bike: degreaser, brush technique, drying properly, and re-lubing so it stays clean instead of collecting grit again.
- How to Put a Bike Chain Back On
Get a dropped bike chain back on in thirty seconds without tools, then fix the derailleur limit screw that let it come off in the first place.
- How to Replace a Bike Chain
Check chain wear, buy the right speed of chain, size it correctly and join it with a quick link — before a worn chain destroys your cassette too.
- How to Remove a Bike Chain Link
Shorten a bike chain correctly: count links, keep inner and outer plates paired, push the rivet cleanly, and rejoin without creating a weak spot.
- How Often to Lube a Bike Chain
Real lubing intervals by conditions and lube type, how to tell when a chain actually needs it, and why over-lubing wears a chain nearly as fast as neglect.
- Remove a Bike Chain Without a Chain Tool
No chain tool? If your chain has a quick link you can open it with a cable loop, string, pliers or zip ties. Here is what works and what will hurt you.
- How to Clean a Bike Cassette
Clear the black paste from between your sprockets with a floss-and-brush method, plus when it is worth removing the cassette and what tools that needs.
Common questions
How often should I clean my bike chain?
Every 200–300 miles in dry conditions and every 100–150 for commuting, plus after any wet or gritty ride. A same-day wipe and re-lube after rain matters more than an occasional deep clean.
When should I replace my bike chain?
At 0.5% wear for 11- and 12-speed drivetrains, 0.75% for 8- to 10-speed. A chain checker costs very little and removes all the guesswork.
Do I need to replace the cassette with the chain?
Not if you replace the chain on time. Past about 1% wear the cassette has usually worn to match, and a new chain alone will skip under load.
Related topics
- Gears and derailleurs
Index your gears, set front and rear derailleur limits in the right order, and shift without crunching the drivetrain — starting with what is actually wrong.
- Cleaning and tune-ups
Wash your bike without forcing water into the bearings, and work through a full home tune-up checklist that finds problems before they leave you walking.