Park Tool Chain Checker CC-2

The Park Tool CC-2 chain tester is used to check that there is no decrease in movement and uneven wear on the chain of your bike. Most manufacturers recommend replacing the chain when it has an elasticity of 1%. With this Park Tool tester you can determine the use and elasticity of any chain by simply inserting the tester punches in two links, press the gauge firmly and then check the gauge window to see the reading.