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