Chain wear indicator - CC-3.2 - from Park Tool USA

Chain wear indicator - CC-3.2 - from Park Tool USA

Some people forget that a chain is a part of the bicycle which needs to be replaced sometimes due to wear and tear and that a worn chain shifts poorly and wears sprockets / cogs at an accelerated rate.

The CC-3.2 is a "go, no go" gauge designed to accurately indicate when a chain reaches 0.5% and 0.75% wear (NOT 1.0 as pictured), the points at which most chain manufacturers suggest replacement.

Made from precision, laser cut steel. 

Note when your chain wears you may also need to replace other components 

Park Tool Reference: CC-3.2