Park Tool CC-3.2 Chain Wear Indicator. A worn bicycle chain can cause poor shifting and in time can even cause excessive wear to the derailleur and rear cogs causing a much more expensive problem. Thats why bike component manufacturers recommend chain replacement at regular wear intervals. The Park Tool CC-3.2 is a go/no-go gauge designed to accurately indicate when a chain reaches 0.5% and 0.75% wear (or “stretch”) the points at which most chain manufacturers suggest replacement. The CC-3.2 is long accurate and features permanent measurement markings. The CC-3.2 works on most derailleur chains* from 5 to 12-speed.

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