Park Tool CC-4.2 Chain Checker Tool

Park Tool CC-4.2 Chain Checker Tool Park Tool

Park Tool CC-4.2 Chain Checker Tool

Park Tool CC-4.2 Chain Checker Tool

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Why is the Park Tool CC-4.2 a better chain checker than a ruler?

The Park Tool CC-4.2 Chain Checker Tool is a laser-cut drop-in gauge that measures chain wear at three calibrated points simultaneously, giving you a fast, definitive reading on whether your chain needs to be replaced. Compatible with 5 through 13-speed derailleur chains and single-speed chains, it reads wear at 0.5%, 0.75%, and 1.0% stretch, which aligns with the replacement thresholds recommended by most drivetrain manufacturers. Catching a chain at 0.5% to 0.75% wear preserves the life of your cassette and chainrings. Waiting until 1.0% or beyond means the chain has already begun to wear matching components.

A worn chain is the most common and most preventable source of expensive drivetrain damage. The CC-4.2 makes checking chain wear fast enough to do at every service, taking less than 30 seconds per chain. The three-point contact design eliminates the guesswork of a single-measurement tool and gives you confidence in the reading regardless of where you sample the chain.

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$19.95
$19.95
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Specs

Wear Indicators: 0.5%, 0.75%, and 1.0% stretch

Compatible Chains: 5 to 13-speed derailleur and single-speed

Design: Laser-cut, 3-point contact drop-in gauge

MPN: CC-4.2

FAQ

What do the 0.5, 0.75, and 1.0 percent wear readings mean?: At 0.5% wear, chains are reaching the end of their useful life for high-end cassettes. At 0.75%, most manufacturers recommend replacement. At 1.0%, the chain has stretched enough to begin wearing matching sprocket teeth, meaning cassette and chainring replacement may also be needed. Replace earlier for 12-speed and higher drivetrains.

What chain speeds is the CC-4.2 compatible with?: The CC-4.2 is compatible with 5 through 13-speed derailleur chains and single-speed chains. It works across road, gravel, mountain bike, and commuter drivetrains.

How often should I check my chain wear?: Chain wear is cumulative and accelerates as mileage increases. Most mechanics recommend checking every 300 to 500 miles or at every service. High-mileage riders, wet condition riders, and those running 12-speed drivetrains should check more frequently.

Best For

Any cyclist who wants to protect their cassette and chainrings by replacing chains at the right time rather than after damage has already occurred. The fastest and most reliable way to check chain wear at home or in the shop.

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