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Probably because the masses don't really see a need for it. But it is definitely possible to build one using today's technology.
If you want a bicycle that can operate as a pedal generator, you can simply put a ("IMA"-based) hybrid on a stand that allows the rear wheel to spin free. Then pedal and use a clamp or something to hold the regen lever, or you can can hack the wiring. Then connect a load of some sort to the battery to make use of the electricity.
With an eCVT bike, you do the same but you don't need to let the rear wheel spin free. You'll definitely have to program the controller to operate in pedal generator mode. Interesting part is that since stands that allow the rear wheel to spin free ("trainers") are way overpriced, the extra small cost of an eCVT over an "IMA" may be well worth it.
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If America manages to eliminate obesity, we would save as much fuel as if every American were to stop driving for three days every year. To be slender like Tiffany Yep is to be a real hypermiler...
Allie Moore and I have a combined carbon footprint much smaller than that of one average American...
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