Park Tool CC-4 Chain Wear Checker Look The perfect blend of performance

The perfect blend of performance and comfort in a flattering fit

giving you the best of both worlds

Whether you're braving wet weather or muddy trails

And when you start to sweat as you climb or prepare to drop in on a descent

fully synthetic lubricant penetrates quickly and deeply into the chain

Park Tool CC-4 Chain Wear Checker Look The perfect blend of performanceA worn bicycle chain causes poor shifting performance and can actually wear out drivetrain components, causing more expensive problems. The Park Tool CC 4 Chain Checker is a drop in style gauge that measures bicycle chain wear. The laser cut CC 4 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 necessary.