The Park Tool Chain Wear Indicator CC-3.2 works on all 1/2" pitch chain, from 1 to 12-speed. Check with manufacturer for specific replacement instructions. For 9 & 10-speed chains, replace chain just as the gauge fits the 0.75% side fits flat into the chain. For 11 & 12-speed chain, replace as the 0.5% side fits. The Park Tool Chain Wear Indicator CC-3.2 is long, accurate & features permanent measurement markings.