Chain Tool

A chain tool is a small mechanical device used to disassemble and reassemble a bicycle chain. It is primarily used to push out and reinsert chain pins (rivets), allowing a chain to be "broken" for removal, repair, or replacement, and then rejoined. Chain tools are also commonly used to resize a bicycle chain by removing the excess links to achieve the correct chain length for a specific bicycle setup.

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Source: Wikipedia · Image: Wikimedia Commons · Public domain

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