Park Tool CC-4 chain checker measures bike chain wear.
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The laser cut CC-4 accurately measures a long section of chain and strategically comes in contact with the chain in three place and is designed to indicate when a chain reaches .5% and .75% wear, the points at which most chain manufacturers suggest replacement. It works on any 5 to 12-speed derailleur chain. A worn chain will cause poor shifting as well as accelerate drivetrain wear.

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