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Check if your chain needs replacing BEFORE you wear out your cogs / sprockets with this chain wear indicator - CC-3.2 - from Park Tool!
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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 .75% and 1% wear, the points at which most chain manufacturers suggest replacement.
Made from precision, laser cut steel.
Park Tool Reference: CC-3.2