The CC-2 is compatible with most single-speed and derailleur chains. For 9 and 10-speed chains, replace chain at or just before the 0.75% reading. For 11 and 12-speed chain, replace at or just before the 0.5% reading. For single-speed chains, replace chain at or just before the 1% reading. Check with manufacturer for specific replacement instructions.
Use the CC-4 for SRAM® AXS 12 speed road chains.