The park tool cc 32 chain wear indicator is a great way to monitor how worn your chain is a worn chain shifts poorly and will wear the sprockets quickly so it39s important you regularly check it to keep your machine performing smoothly this park tool bike tool boasts a gono go guage which has been designed to give accurate readings whenever a chain reached 05 to 075 wear this is the point when most manufacturers would suggest a replacement to prevent the other drive train compon