To alleviate poor shifting & uneven drive train wear, manufacturers recommend chain replacement before rear cog replacement. Now you can quickly & accurately determine the wear & stretch of any chain with the Park Tool Chain Checker. Simply insert the Chain Checker’s pins into two links, press the swing arm gauge tight, & then check the gauge window for an accurate reading.
CC-2 Features The CC-2 is 10- & 11-speed compatible. For the modern 9- & 10-speed chains, replace chain at or just before the 0.75% readings. For an 11-speed chain, replace at or just before the 0.5% reading.