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  • How old is the cog? If you've put a new chain on a worn cog it can make a crunching sound.

  • Can't remember exactly but I would guess no older than April. I also considered it but it doesn't look particularly worn at all. However, I am a courier so all my components seem to wear out ridiculously quickly.

    If the noise persists after tomorrow's ride, I'll stick on a new cog.

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