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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.
5-To-10 Speed Chains – Replace chain at or just before 0.75%
11-To-12 Speed Chains – Replace at or just before 0.5%
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.
The CC-2 is Compatible with Most Single-Speed and Derailleur Chains, Including Shimano® XTR® 12-Speed Chains