Park Tool CC-4 Chain Checker

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.

• Drop-in style gauge
• Laser cut CC-4 accurately measures a long section of chain
• Strategically comes in contact with the chain in three places
• Compatible with 5-12 speed derailleur chains (including SRAM AXS)
• Designed to accurately indicate when a chain reaches .5% and .75% wear