Park Tool CC-4.2 Chain Checker Groupe 4 valve cores

4 valve cores

and is designed to accurately indicate when a chain reaches 0

Water resistant zipper with large pull loop

Choose between different widths (measure your internal rim width and add 2mm)

Park Tool CC-4.2 Chain Checker Groupe 4 valve coresA 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