Chain checker Park Tool CC-3.2 for accurate chain wear measurement

The Park Tool CC-3.2 chain checker is a compact, go/no-go gauge created to give accurate chain wear measurements for modern bicycle drivetrains. Its simple one-piece design and permanent measurement markings let you determine whether a chain has reached the common wear thresholds of 0.5% and 0.75%, helping to avoid poor shifting and accelerated sprocket wear. The CC-3.2 is long and rigid enough to seat cleanly in the chain for repeatable readings on a broad range of multi-speed chains.

Advantages

The tool provides clear, binary indications at industry-standard wear points so users can decide when to replace a chain without guesswork. It is lightweight and durable, with permanent markings that do not fade with use. The simple, no-adjustment design requires no calibration and works quickly during routine maintenance checks, making it suitable for home mechanics and professional workshops alike.

Suitable for

• Routine drivetrain maintenance and inspection
• Workshops and bike shops performing quick wear checks
• Home cyclists who perform their own chain care
• Preparing bikes for long rides or storage to prevent drivetrain damage

Key specifications

• Go/no-go gauge indicating 0.5% and 0.75% chain wear thresholds
• Designed for multi-speed bicycle chains including 9–12 speed systems
• Long, rigid form factor for stable seating in the chain
• Permanently engraved measurement markings for long-term use
• Simple one-piece construction requiring no calibration

How to use

Place the gauge into the chain links so that the tool seats naturally against the rollers and plates. Check whether the 0.5% side or the 0.75% side fits flush into the chain; for 9- and 10-speed chains, a flush fit on the 0.75% side indicates replacement is recommended, while for 11- and 12-speed chains a flush fit on the 0.5% side indicates replacement. Use the tool on a clean chain for the most reliable reading and inspect multiple link positions to confirm the result.

Usage recommendations

Perform chain checks regularly as part of scheduled maintenance—more frequently for high-mileage or off-road use—to protect sprockets and other drivetrain components. Clean the chain before measuring and store the gauge in a toolbox or saddle bag for quick access during inspections.