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The transmission systems of bicycles are multi-speed systems to satisfy different kinematic requirements. The transmission system of a bicycle can be the external changing-speed system or internal multi-speed system. A complete multi-speed transmission device of a bicycle must contain multi-speed gear unit, control device, and operating device. This paper focused on the systematic design and prototype manufacturing of multi-speed transmission device of a bicycle. Based on the results ofdoi:10.1051/matecconf/201818500035 fatcat:swhsxnco5jg45lrgaximk2hjiq