Park Tool CC-2 Chain Checker

The Park Tool CC-2 Chain Checker is a precision measurement tool used by bicycle mechanics to determine the degree of chain wear. Developed by Park Tool, a company founded in 1963 in St. Paul, Minnesota, the tool is a staple in bike shops worldwide. It utilizes a swing-arm design to provide a percentage reading of chain stretch, which helps riders decide when a chain needs replacement to avoid damage to the cassette or chainrings.

Park Tool remains a privately held American company. The majority of their tools, including professional-grade measurement equipment like the CC-2, are manufactured at their facility in Oakdale, Minnesota. This ensures high quality control standards that have made the brand a leader in the bicycle tool industry for over six decades.