Refined title: CC-4 Chain Wear Indicator

The Park Tool CC-4 Bicycle Chain Checker is a drop-in style gauge that measures bicycle chain wear. The laser-cut CC-4 accurately measures a long section of the chain and strategically comes into contact with the chain in three places, quickly and easily taking the guesswork out of determining when chain replacement is necessary.

The tool is designed to work on any 5 to 12-speed derailleur chain, including SRAM AXS and Shimano XTR 12-speed chains, and accurately indicates when a chain reaches 0.5% and 0.75% wear, the points at which most chain manufacturers suggest replacement.

The CC-4 provides measurements at the two most common wear intervals recommended for chain replacement on multi-speed bicycles: <0.5% Wear, which is acceptable on all derailleur and single-speed drivetrains, ≥0.5% Wear, where 11-to-12-speed chains should be replaced, and ≥0.75% Wear, where 5-to-10-speed chains should be replaced.

Park Tool offers several options for measuring chain wear, depending on the user's needs and drivetrain components. The CC-2 and CC-3.2 are also available, with different measurement styles and compatibility.

A worn bicycle chain causes poor shifting performance and can actually wear out drivetrain components, leading to more expensive problems. The Park Tool CC-4 Chain Checker takes the guesswork out of determining when a chain needs to be replaced, helping to maintain the optimal performance and longevity of the drivetrain.

Since its origins in the back of a bike shop in 1963, Park Tool's sole mission has been to design and manufacture high-quality tools that empower mechanics and riders of all skill levels to service their bicycles. The CC-4 Chain Checker is a testament to the company's decades of experience and expertise in the industry, in the shop, and on the trail.

The CC-4 is compatible with all 5-to-12 speed chains and accurately measures wear on all 1/2" pitch bicycle chains. It is a trusted and reliable tool for ensuring the proper maintenance and longevity of a bicycle's drivetrain.

product information: