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aero bars (cervelo) save ~7.7 W at 30 mph.
4cm narrower bar saves ~1.2watts
hands/arms closer together saves ? :)Internet aero-fitting is an exact science...
http://djconnel.blogspot.dk/2014/08/cervelo-s5-and-aero-road-bars.html
What'd be more aero overall- a 38cm bar or a 42cm aero top bar?