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Normal bicycle has been used to vehicle. Moreover, tandem has risks for children. This bicycle design which came from kangaroo motive, however, is considered safety. Besides, Adult and kid can ride together. The way adult rides is as same as normal bicycle. It can be used as a tandem by unfolding the seat and pulling the pedal located in the middle of frames when adult rides this tandem with kid.One of the cranks which is pedaled by kid doesn't affect drive. This satisfy not only safety but also kid's psychological need to follow adult's action. Through this tandem parents and child can share each other's feeling.