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The bicycle riding are recreational sports and games for many people. Additionally, the riding can reduce carbon generation and is an environmental tool. The chain maintain is important and necessary, sine the chain is an essential element of a bicycle that determine the bicycle is comfort and safe or not. The purpose of this study is to investigate the design method of a tool to measure and disassemble the chain for insurance the bicycle riding is safe. Based on the design concepts of existed tool with measure or disassemble function, this study design a chain maintain tool with measure and disassemble functions and establish the CAD drawing of the designed tool.
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