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  1. onceanmxernowamtber on

    How worn was the 17T cog? Chains and cogs wear together, putting on a new cog with a worn chain may result in compatability issues. Is your front chainring a thick/thin one? Check the chain is correctly aligned with the teeth of the chain ring.

  2. Probably caused by a new cog and a not new chain so they don’t mesh together well. Had that happen on some gears when I changed a new freewheel with the old chain ring and old chain. Eventually it went away after riding.

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