CC4.2 Bike Chain Checker Tool

Park Tool CC4.2 Bike Chain Checker Tool

The Park Tools CC4.2 Chain Checker Tool is a must-have for any home mechanic. Within a few seconds, you can determine if your chain has stretched enough to need replacing. Stretched and worn out chains can cause damage to the drivetrain and simply don't shift as accurately as they should. The three contact points of this accurate device indicate wear of .5% and .75%; the stages at which most chain manufacturers recommend replacement.

Compatible with all 5-speed to 12-speed chains, including SRAM AXS options.