A worn chain shifts poorly and wears sprockets at an accelerated rate. The CC-3.2 is a go/no-go gauge designed to accurately indicate when a chain reaches 0.5% and 0.75%, the points at which most chain manufacturers suggest replacment.
– For 9 and 10-speed chains, replace chain just as the gauge fits the 0.75% side fits flat into the chain
– For 10 and 12-speed chains, replace as the 0.5% side fits.
The CC-3.2 works on all 1/2″ pitch chain, from 1 to 12-speed.
Check with manufacturer for specific replacement instructions.