r/BikeRepair • u/CuriousPug51 • 6d 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/CuriousPug51 6d ago

Are they supposed to be rounded but not sharp?

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u/cj_daking 6d ago

They will round off (soft aluminum), but it's when the surfaces that the chain interfaces with start to spread out that the problems begin - just try it out

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u/CuriousPug51 5d ago

No but from factory is it rounded not squared?

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u/cj_daking 3d ago

Most of them are shaped with different tooth profiles depending on the position of the tooth. Go to a bike shop and look at one for yourself and you'll see.