Chain alignment friction losses

Some time ago I posted a question about the possible friction losses
when various "gears" are used. Subsequently I have come across a test
of both chain misalignment and sprocket size friction losses.

The test was done with 53-39 front chain rings and a
11-12-13-14-15-17-19-21-28 cassette. The lowest losses were with the
39/17 combination and the highest with the 53/11. Losses with the
53/11 combination were 3.467 times higher than with the 39/17.
The graph states that it is based on the "optimal shift sequence using
the ring-cog combinations with the lowest frictional losses yet
maintaining an acceptable range of final gear ratios."
https://www.ceramicspeed.com/en/cycl...g-size-report/

The second part of the test shows the friction losses with the chain
aligned and using the various ratios of the cassette and chain rings
above.
The lowest losses were with the 53 tooth chain ring and the highest
with the 39 tooth chain ring in all "gears". In other words the 53/ 11
ratio had ~8.2 watts losses while the 39/11 ration had ~8.5 watts. The
53/28 had ~5.6 watts losses and the 39/28 had ~6.2.

--
cheers,

John B.