Old 07-06-20, 02:30 AM
  #15  
Jipe
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Yes, there are many studies showing that the efficiency drops with smaller cogs.

But there are other factors like dirt that have also a major effect on chain transmission efficiency.

The same apply for wear: smaller cogs wear faster but also for wear, dirt has a bigger effect and it is well known that encapsulated chains last much much longer than chains exposed to dirt.

Now what does this mean in real world experience: as said for wear, I do not know yet. But for efficiency, honestly, I do not feel any difference between 9t or 10t and the classic 11t smallest cog (I also have two Moulton using the proprietary 10-28 Moulton cassette).
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