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 .5% and

.75%, the points at which most chain manufacturers suggest replacement.

For 9 and 10-speed chains, replace chain just as the gauge fits the 0.75% side fits flat into the chain.

For 11 and 12-speed chain, replace as the 0.5% side fits.

The CC-3.2 is long, accurate and features permanent measurement markings.