Park Tool Chain Checker (CC-4) colour-dark-grey always load the heaviest bikes

always load the heaviest bikes nearest to the car

while polyester content pulls moisture away from your skin

We recommend using warm water and allowing all hot parts to cool before use

manufacturers recommend chain replacement before rear cog replacement

The sophisticated drive system provides enough smooth and reliable assistance at levels designed to enhance your ride

Park Tool Chain Checker (CC-4) colour-dark-grey always load the heaviest bikesAbout Park Tool Chain Checker (CC 4)The CC 4 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 knowing when chain replacement is necessary. A worn chain will cause poor shifting as well as accelerate drivetrain wear. The tool works on any 5 to 12 speed derailleur chain