Park Tool CC-4.2 Chain Checker General One lever-One action

One lever-One action

Integrated cable tension adjustment

4mm) box-end wrench fits Park Tool Freewheel / Cassette Lockring Tools

Attachment: flat mount

Park Tool CC-4.2 Chain Checker General One lever-One actionA worn bicycle chain causes poor shifting performance and can actually wear out drivetrain components, causing more expensive problems. The Park Tool CC 4. 2 Chain Checker is a drop in style gauge that measures bicycle chain wear. The laser cut CC 4. 2 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 determining when chain replacement is