I road a Currie Tec Izip bike the other day, it was rather nice for being a ready made product, top speed of 15mph (to slow for my taste) but it was simple to operate, you simply ride it like a bicycle, the motor speed was based off pedal speed and torque (yes, torque too, I spoke with one of their enginers) so all you did was pedal, and it helped, pedal faster and you go faster, I liked them because they have NiMH batteries hidden in the frame (two screws to removed) and only weight about 40 pounds total, the down side was the slow top speed, altho they have a range of around 30 miles, mostly because you have to pedal as well, so at most I would guess it's adding %50-%60.
I like the idea behind the design of these bikes, being that they are so simple to use that people who would otherwise be driving a car might think about operating them, altho I dislike their slow top speed, but that is partly because of their goal of reaching the masses, and some states requireing low top speeds of electric bikes, where wisconsin alows 30mph top speed on electric bikes.
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