Park Tool CC-3.2 Chain Wear Indicator

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.

Made in the USA..

The co-owners were hands-on bicycle repair folk back in the 1950s when bikes were simpler.  Starting in the 1960s, bikes started getting more complex and the need for purpose-specific bike tools arose and Howard and Art met that need.  Now more than 50 years into its journey, Park Tools is still developing and producing some of the finest bicycle tools in existence.