Park Tool CC-4.2 Bicycle Chain Wear Checker

Price: $19.95
(as of Jan 31, 2026 21:16:09 UTC – Details)

Product description

Park Tool CC-4.2 Bicycle Chain Checker

A worn bicycle chain causes poor shifting performance and and actually wear out drivetrain components, causing more expensive problems. The Park Tool CC-4.2 Chain Checker is a drop-in style gauge that measures bicycle chain wear. The laser cut CC-4.2 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 tool works on any 5 to 13-speed derailleur chain (including SRAM AXS and Shimano XTR 12-speed chains) and is designed to accurately indicate when a chain reaches 0.5%, 0.75% and 1.0% wear, the points at which most chain manufacturers suggest replacement.

The CC-4.2 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≥1.0% Wear – chains on single-speed and two-sprocket systems should be replaced at or before this measurement

Park Tool offers several options for measuring chain wear, depending on your needs and drivetrain components:

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Price

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Measurement Style
Incremental Reading – 0% to 1% Go/No-Go – 0.5% & 0.75% Go/No-Go – 0.5/0.75/1.0%

Single-Speed Chains

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Most 5-to-12 Speed Chains

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SRAM AXS 12-Speed Chains
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TRUSTED SINCE 1963

Since our origins in the back of a bike shop in 1963, it has been Park Tool’s sole mission to design and manufacture high-quality tools that empower mechanics and riders of all skill levels to service their bicycles. 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.

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-13 speed chains
Compatible with single-speed chains
Compatible with SRAM AXS 12-speed chain
Go/no-go gauge indicates 0.5%, 0.75% and 1.0% wear
Made in the USA