CC-4.2 Chain Checker

What Our Gearhead® Experts Are Saying:

“The CC-4.2 is a no-brainer for anyone who’s serious about bike maintenance. It’s easy to use and gives precise readings, helping prevent bigger issues with the drivetrain. I love that it works with all kinds of chains, so it’s great for any bike I’m working on.”

When it comes to keeping our bikes running smoothly, chain wear is something we never overlook. The Park Tool CC-4.2 Chain Checker takes the hassle out of this crucial maintenance task by providing precise, easy-to-read measurements. This laser-cut tool engages the chain at three points, measuring across a longer section for more accurate readings. Compatible with 5- to 13-speed chains, it’s versatile enough for road, mountain, or gravel bikes, and it clearly shows when your chain hits the 0.5%, 0.75%, or 1.0% wear thresholds—letting you know exactly when it’s time for a replacement. Keeping your drivetrain in top condition has never been easier.