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@M_V
The research in that link seems to prove that cranks that are too long (220mm) are just (in)efficient as cranks that are too short (120mm) but it does not relate that to cranks in the 'normal' range ie 165-175mm.
I have ridden 150mm cranks for polo recently and in the past I've ridden 180mm cranks on a ss road bike and I can assure you that crank length does make a difference. Possibly in the same way that sugar pills can cure illnesses but that's still an effect.