Park Tool CC-2 Chain Wear Indicator
- Quickly and accurately determine the wear and elongation of any chain.
- Compatible with all bicycle chains
- For modern 9 and 10 speed chains, replace chain at or just before the 0.75% readings
- For 11 speed chains, replace at or just before the 0.5% reading
- Insert the Chain Checker's pins into two links, press the swing arm gauge tight, and check the gauge window for an accurate reading