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6

I expect that after 10,000 km your chainring also needs to be replaced (frankly, I find it astonishing that you made it that far without replacing anything else. That's amazing.). Am I correct in guessing that you spend most of your time in your middle chainring? If so, it will be significantly more worn than your large or small rings, which would explain ...


5

Cogs and chains "wear together" (regardless of whether they are front rings or rear sprockets). The old chain does not slip on the ring, because the old chain's rollers are worn down. They have an overall smaller diameter than the rollers of a new chain, and also a different shape: new rollers are cylinders, but worn ones look like small pulleys, they have ...


1

The chain will typically slip under the following conditions: 1. the chain is worn out (this can be measured with a cheap tool, or by your LBS). 2. the cassette is worn out 3. one or more of the chainrings (the cogs on the crankset) is worn out 4. the chain and/or cassette/cogs/pulley wheel are dirty and full of oil/road-grit/gunk. These can occur ...



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