The CC-4 is a drop-in style gauge that measures bicycle chain wear The laser cut CC-4 accurately measures a long section of chain and strategically comes in contact with the chain in three places, quickly and easily taking the guesswork out of knowing when chain replacement is necessary A worn chain will cause poor shifting as well as accelerate drivetrain wear The CC-4 works on any 5 to 12-speed derailleur chain (including SRAM AXS) and is designed to accurately indicate when a chain reaches.5% and.75% wear, the points at which most chain manufacturers suggest replacement Made in the USA and covered by Park Tool's legendary limited lifetime warranty
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