• Ask to speak to the manager:

    • fitting a 1/8" sprocket to a 3/32" drivetrain is such a basic error it's astonishing that anyone that stupid is allowed near a spanner;
    • trying to palm you off with worn chain bollocks only compounds their initial mistake with a downright lie.

    Get your money back and go to a proper bike shop: 3/32" fixed sprockets are readily available.

  • I would take a guess that 1/8"is default? pretty sloppy to miss the chain size though.

    @skidlidsid , swapping a cog is pretty straightforward. If you can't deal with the hassle of Evans I can lend you the tool to swap to a 1/8" cog.

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