• Recently I tried to use a flat top chain on a Eagle drivetrain with a not compatible narrow wide chain ring in front and GX derailleur - and it works fine. Is it because the tooth of the chainring gotten smaller, and of the derailleur or why does it work? It should not work as I read, but wanted to give it a try. I‘ll get a proper Eagle chain, but just wondering.

  • Because parts manufacturers want you to believe that things are incompatible so that you continue buying the specific expensive chains etc.
    I've been using a Sram flat top chain with a Shimano 11 speed groupset for 5000km and it is running sweet still.
    It's fine.

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