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Old 05-15-18, 08:41 AM
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Bikes: 2011 Trek 1.2 + 2016 Trek 1.1 H2

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Park Tool CC-2 Chain Checker

The Park Tool CC-2 Chain Checker is used to measure the chain stretch. It works on 7-Speed to 12-Speed chains. Mine is a 9-Speed chain.

The CC-2 measures 5.35" long, 0.40" wide (body) and 0.40 tall (body). The mass is 42g.

The chain wear (stretch) is important to measure to ensure that a worn chain does not degrade the cogs and chainrings. The measurement permits determination of the chain condition so that the replacement timing is appropriate.

The CC-2 has a set of pins and a moveable plate w/ a measurement scale. An instruction sheet is included.

Making the measurement is easy. Set the scale on 0%, insert the pins into the chain links, lightly push the arc plate until the pins are just snug, then read the measurement scale.

The included instructions state that 5,6,7,8 and 9-Speed chains should be replaced when the measurement is 0.75%. The 10, 11 and 12-Speed chains should be replaced when the measurement is 0.50%.

When I made the measurement, I performed this at multiple locations along the length. There was a small variability depending upon the location.

I would not hesitate to recommend this tool.

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