Park Tool CC-3.2 Chain Wear Indicator

The Park Tool CC-3.2 chain wear indicator checks chain wear at 0.5% and 0.75% stretch, recommending replacement to prevent excessive wear on components.

• The description claims that replacing the chain at or before 0.75% wear for 5-10 speed chains and at or just before 0.5% wear for 11-12 speed chains prevents excessive wear.