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My answer will not answer your question but will give some light on working around it. Instead of replacing the cog or messing around with chain tension you can adjust the length of your chain just right by using one of online chain length calculators and possibly a half link. This is what I did with my vertical dropouts modern frame converted to single ...


I went to my favorite cycle mechanic and he dropped kerosene on the derailleur and then brushed the dirt off easily.


Here are some points taken from the literature: Mechanical efficiency is usually 88-98% for majority of deraileur systems (when clean,lubricated and new) Drivetrain efficiency decreases with smaller rear cogs, Highest efficiency can be reached at high torques and low cadence, Chainline effects are negligible, imposible to note with measurement apparatus, ...


Chainline would have a (small) effect. If you are cross chaining 36 to 12 then that would not be as efficient and cause more wear. Geared versus single speed is another question in my mind as a lot changes - type of chain. Same chainline I doubt the efficiency difference is enough to measure. On a smaller rear the chain has to take a tighter radius ...

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