evo.com | Park Tool General Shop Tools > Make sure your chain is always ready to go with the Park Tool CC-2 Chain Checker. This handy tool checks the wear on any bike chain, so you can keep your drivetrain running at peak performance. The CC-2 is Compatible with Most Single-Speed and Derailleur Chains, Including Shimano(R) XTR(R) 12-Speed Chains 11-To-12 Speed Chains Replace at or just before 0.5% 5-To-10 Speed Chains Replace chain at or just before 0.75% Single-Speed Chains Replace at or just before 1% How to Use Simply insert the Chain Checker's pins into two links, lightly press the swing arm gauge, and then check the gauge window for an accurate reading. | Park Tool CC-2 Chain Checker 2025 - OS in Black