■ Background When I saw my middle aged co-worker ride her broken electric bicycle, I wondered why she kept riding such a heavy bike that wouldn't be assisting her electrically anymore. Her answer was clear "Electric bicycle is expensive to replace" Currently, it's cost more than100,000 yen (about US$1,000) to buy a motor-assisted bicycle. It is not affordable very much. I've started thinking if there is a unit that converts an ordinary bicycles into an electrically assisted bicycles . ■
Motor, battery and control panel are integrated, yet small. I'm imagining to have a rear wheel sandwiched between two motors to assist the rider.