Park Tools CC-4.2 - Chain Wear Indicator

The Park Tool CC-4.2 Chain Checker measures bicycle chain wear and indicates when replacement is necessary.

• The tool accurately measures chain wear and indicates when a chain reaches 0.5%, 0.75%, and 1.0% wear.
• The tool works on various 5 to 13-speed derailleur chains and single-speed chains.
• The tool claims to take the guesswork out of determining when chain replacement is necessary.
• Park Tool's CC-4.2 Chain Checker is made in the USA and covered by a limited lifetime warranty.