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  • I've got a worrying pop/clank sound coming from the drivetrain on my mercian track, using a 1/8 chain from an old hercules ladies bike on 1/8 villiers cog and 1/8 ta chainring, seems to be coming from the chain's connection with the cog over any bb problems, and is quiet when hand spinning but loud when riding. chainline is perfect, and its greased etc, not over tight either...

    have searched google and on here, but can seem to get any ideas as to what the problem is... loathe to just buy a new chain as that might not be the issue.. sorry if Ive missed something super obvious.

    anyone know if older 1/8 chains/cogs had different sizings or anything?

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