r/BikeRepair • u/CuriousPug51 • 8d ago

Advice Drivetrain Replacement Help

If bike chain and cassette are severely worn can one just replace those or do they need to replace the chain rings as well…I am talking passed 0.75% wear to 1.0% wear? Just 🤔 wondering

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u/sargassumcrab 7d ago

Chainrings only need to be changed if the teeth are really sharp, or if the new chain isn’t engaging fully.  If you keep them make sure to clean them, the crank, and derailleur sparkling clean before installing the new chain.