Park Tool CC-4.2 Chain Checker Groupe DO NOT use in the

DO NOT use in the hubs

4 valve cores

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

and is designed to accurately indicate when a chain reaches 0

Park Tool CC-4.2 Chain Checker Groupe DO NOT use in theA 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