Park CC-3 Chain Checker - Chain Stretch Gauge

«  ↑  » Park CC-3 Chain Checker - Chain Stretch Gauge Need to know when to replace your chain? A chain wear indicator makes it easy to know when accurately. It works by measure the stretch of your chain, indicating when your chain reaches .75% to 1% wear, which is when most manufacturers suggest chain replacement. Precision laser cut steel. Item no longer available. Click Search to find alternatives...