• All is dandy now except one little detail - for whatever reason chain keeps rolling off the lower pulley of the rear derailleur when it's set to smaller chainring and smallest cog:

    All other combinations work perfectly but for some reason small-small doesn't. Too long chain, wrong derailleur setup or something else?

    I know that small-small is a no-no in general but is it really supposed to not work at all?

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