It would be possible to measure chain tension variations and compute the losses directly from that (against baseline data on the chain from a lab test).
Beyond my paygrade. Job for Balor.
I missed an opportunity to do this as I sold my Bacchetta shortly after acquiring my S40. I have both a Powertap hub and Asioma power pedals. Would've been an interesting experiment.
Just put them on a Neo smart trainer.
A sample size of one isn't particularly interesting. I'd have been interested in performing the experiment @ed72 mentioned which would be comparing the drivetrain loss from a rear drive bent versus the S40. I no longer have the Bacchetta so not possible.
