Engineers love an elegant solution. Marketing managers like value added features. Most of us want convenience and comfort. The irony of this whole thread is that we could build a very efficient, comfortable, and safe bicycle that includeds many features listed. The components and materials are available now. The wonder bike could be put together for less than 1,000 USD and weight under 40 lb. Aluminum honeycomb is still cheaper than carbon fiber and has excellent energy absorption. I like hex mesh glued between sheet plastic for fairing material along with coroplast and foam. Yes, Craig Vetter's new Alcan fairing is aluminum. Check out the Gravity Racers for designs.
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