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A new differential gear mechanism is presented in this paper. By using this mechanism, it is possible to control the rotation of the target axis without any effect on axes passing through, and then because of easy to produce, 2 wheel drive bicycle is manufactured, i.e., the driving force from the rear wheel transmits to the front wheel in high transmission efficiency without any interference in steering. The basic working principle is based on the patent (JP03/03449). The expected market with business model is shown in this paper.