Chain-Wear Indicators CC-3.2C & CC-2

Park Tool
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Park Tool CC-2 Chain Wear Indicator

A worn chain shifts poorly and wears sprockets at an accelerated rate. Park Tool Chain-Wear Indicator 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. The updated CC-3.2 is longer, more accurate and features permanent measurement markings.