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Park Tool CC-4 Chain Wear Indicator

Park Tool CC-4 Chain Wear Indicator

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 tool 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.

  • 5-to-10-speed chains: replace chain at or just before 0.75%
  • 11-to-12-speed chains: replace at or just before 0.5%
  • Check with manufacturer for specific replacement instructions

CC-4 Instructions (PDF—76.356 KB)