Park Tool CC-4.2 Chain Checker Groupe and is designed to accurately

and is designed to accurately indicate when a chain reaches 0

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

you not only benefit from the significantly greater durability of CeramicSpeed ​​bearings

The rocker arm was optimised to interface with sprockets that have from 11 to 32 teeth

Park Tool CC-4.2 Chain Checker Groupe and is designed to accuratelyA 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