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Science
The truth according to science is interesting. We can debate the scientific method and it's accuracy. But even if we came to some kind of agreement - crank length, tire size, aero efficiency - what grand difference does it make to the non-professional, or even the occasional racer? The differences are so, so marginal (my opinion.) And we pay a lot of $ converting tires, wheels, equipment to chase such improvements. Why? To set a new pr? To impress the group ride? I suspect the bike industry and bike media push the latest for obvious reasons. Every little "improvement" becomes the "next" thing and the next article. It will never end. That is not to write some improvements are not worth it, but one needs to be discerning and for me the issue is cost. We can pay a lot for a little. But - each to his or her own.
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