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his is a electric mountain bicycle that can generate electricity, there are ring-shape Piezoelectric materials inside the rims ,when user riding the bicycle , ground would give pressure to both the front wheel rim and the back wheel rim , so that the wheel rims would squeeze the Piezoelectric materials ,produce electricity to the battery , reduce power consumption, achieve the effectiveness of energy conservation and environmental protection .Even the battery is depleted , user could charge the battery by pedaling, besides, the bicycle also can be charged by a general plug .