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chain transmission system for bicycles, cycles in general, for implementing a relationship be variable during the course of each round.by means of one or more wheels) of signature stretched, with the two extremities, or machine, shaped circular sector.
chain transmission system for bicycles, cycles in general, for implementing a relationship be variable during the course of each round.by means of one or more wheels) of signature stretched, with the two extremities, or machine, shaped circular sector.
