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While it's true that a larger chainring will have slightly less friction and thus slightly more efficiently, it's an extremely negligible amount, that you wouldn't be able to feel. More importantly, are your crankarm lengths different on the new crankset than the old? That makes a much bigger difference. For example, if you've went from 175's to 170's, that ...


The larger chainring reduces drive chain friction - so is more efficient. This article from cyclingtips lists a study which demonstrated this You can see the effects of this in the peleton where riders like Froome are favouring assymetric rings to give them periods of greater efficiency and reduced torque during pedalling


Talking about science, there are two factors here: moment of inertia - smaller and lighter cogs in a compact crankset mean smaller moment of inertia, which in turn means that you need smaller force to obtain the same acceleration. In this aspect a compact crankset gives a slight advantage. Note: this parameter is practically insignificant when it comes to ...

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