Park Tool CC-4 Chain Wear Indicator - REV Endurance Sports

A worn bicycle chain causes poor shifting performance and and actually wear out drivetrain components, causing more expensive problems. The laser cut CC-4 accurately measures a long section of chain and strategically comes in contact with the chain in three places, quickly and easily taking the guesswork out of determining when chain replacement is necessary. The CC-4 provides measurements at the two most common wear intervals recommended for chain replacement on multi-speed bicycles: <0.5% Wear - acceptable on all derailleur and single-speed drivetrains. ≥0.5% Wear - 11-to-12-speed chains should be replaced at or before this measurement ≥0.75% Wear - 5-to-10-speed chains should be replaced at or before this measurement Park Tool offers several options for measuring chain wear, depending on your needs and drivetrain components: As with our other 500+ tools, our chain tools are a product of our decades of experience and expertise in the industry, in the shop and on the trail. Chain Wear Indicator Takes the guesswork out of determining when a chain is worn out Accurately measures wear on all 1/2 pitch bicycle chains Compatible with all 5-to-12 speed chains