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The Park Tool CC 3.2C Chain Wear Indicator Tool easily identifies when it's time to replace your chain. With no room for error, this go/no go gauge is long, accurate, and has permanent indicators for simple use.
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%
Go / No-Go Gauge
Permeant Measurement Markings
Check with Manufacturer for Specific Replacement Instructions
The CC-3.2 Works on Most Derailleur Chains from 5 to 12-Speed