Sam Calder built Rule 28 on the unglamorous truth most amateurs ignore: aerodynamics is the cheapest speed in cycling, and almost nobody tests it. His work in the wind tunnel — including the much-discussed aero test that saved Dylan Johnson 13 minutes — reframes free speed as an engineering problem rather than a marketing claim. For Roadman's audience the lesson is blunt: at the same FTP, position and clothing decide more of your time on flat and rolling terrain than another winter of intervals will.
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Where Calder lands on the questions people ask most.