A worn chain shifts poorly and wears sprockets at an accelerated ratethe cc 3 is a go no go gauge designed to accurately indicate when a chain reaches 075 and 1 wear the point at which most chain manufacturers suggest replacementthe chain should be replaced soon if the 075 side fits into the chain before other drive train components also start to wear out fastif the 1 side fits into the chain the chain is worn out and should be replaced immediatelymade from precision laser cut steelcon