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Old 01-26-23, 05:17 AM
  #18  
PeteHski
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Originally Posted by Trakhak

The only other pertinent consideration would be the fact that mechanical: frictional losses within the chain increase as the sprocket size decreases. Unless frictional losses also accrue from the use of a combination with a large offset in chain line between the chainring and sprocket, and those losses are greater.
I think the differences in friction between practical sprocket sizes sometimes gets blown out of proportion. The entire drivetrain typically has a power transmission efficiency of around 96%, give or take 1%. So at 200W you could expect to lose around 6-10W max depending on how clean your drivetrain is. While that is still significant, there isn't a lot you can do about it. For example a 2x drivetrain might save you a couple of Watts over an equivalent 1x due to chain line differences, gear sizes etc. Basically not very much. Then when you start looking at differences between things like 10t vs 11t sprocket or a 52t vs 48t chainring on the same drivetrain, it's going to be fractions of Watts that really don't matter at all. Basically you stand to gain more from cleaning your drivetrain!
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