-
chainline efficiency .. there is a term for this @umop3pisdn might know
-
Chainline efficiency is the reason for single ring - 58t vs 53t means you get basically the same gear with a sprocket 1t bigger with slightly less (single w) lost to the chain.
eTap FD is also bulky as fuck.
Reason he's got a reasonable cassette spread is cos UCI do daft things like have TT courses that aren't completely pan flat.
When the only ring you need is the big ring. Surprised he doesn't have a 11-22 11psd cassette on there too.