The item that you are looking at is more of an electric moped, not a bicycle. Why are you looking at this particular item? If it is because they represent themselves as "green", guess again. Riding a regular pedal only bicycle is much more green than riding a motorized bike, even if it is electric. Sure there is no carbon footprint to this bike unless you count the carbon footprint from manufacturing the bike and the batteries. But then you have to factor in charging the batteries. Where is the electric power coming from that is charging the batteries? If you are fortunate enough to live near one it will be generated by a solar farm, or maybe windmills. But if you are like 95% of the rest of us, it is coming from coal fired power plants. Not so green anymore, is it?
Only walking is a greener form of transportation to a true, pedal only bicycle. The only carbon footprint that there is on a real bicycle is in the manufacturing process, and then it ceases to be contributor to carbon production. The only power source is the rider. No electricity expended, no gasoline, no diesel. (If you want to split hairs though, I suppose that you could contend that the rider's exhalations could be considered part of his carbon footprint.)
One other consideration, this vehicle, by virtue of its electric motor, would not be permitted on most recreation trails.
