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The "modular bicycles" is a new conception. By means of assembling or aking apaert of the modules, this research let the bicycles that are useing for recreational purpose can be riden by both single and couple. This article first devide the modular bicycles into three sub-systems for discussion: frame system, transmission system and brake system, then formulate every part''s problems and design objective, consideration, constract. After this is done, we begin the stage of conception design. In this stage, two method are used at the same time to generating new concepts: one is extracting the current device, theother is Brain storming method. All the new concepts that are generated by the both methods are evaluated and modified in order to find the viable concepts. After the stage of concept design is finished, the prototype will be made to verify the concepts that we have choosed and modify them if necessary.
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