Park Tool CC-4.2 Chain Wear Indicator

Park Tool CC-4.2 Chain Wear Indicator

The Park Tool CC-4.2 Chain Wear Indicator is a precision bike chain checker and chain wear gauge designed to quickly and accurately measure bicycle chain wear. Regularly checking your chain helps maintain smooth shifting, protects expensive drivetrain components and lets you know exactly when it's time for a replacement chain. Suitable for home bike mechanics and professional workshops alike, the CC-4.2's laser-cut, drop-in design measures a longer section of chain and contacts the chain at three points for fast, reliable wear readings with no guesswork.

Compatible with 5 to 13-speed derailleur chains, including SRAM® T-Type, SRAM® Flattop™, Shimano® XTR® 12-speed and Campagnolo® Ekar™ 13-speed chains, as well as single-speed chains, the CC-4.2 accurately indicates when a chain reaches 0.5%, 0.75% and 1.0% wear - the replacement points recommended by most chain manufacturers. An essential bike maintenance tool for routine drivetrain servicing, it helps maximise drivetrain performance and reduce wear on your cassette and chainrings.

• Precision bike chain checker and chain wear gauge

• Laser-cut drop-in design for quick and accurate chain wear measurement

• Measures a longer section of chain using a three-point contact design for increased accuracy

• Suitable for 5 to 13-speed derailleur chains and single-speed chains

• Compatible with Shimano®, SRAM® and Campagnolo® drivetrains, including the latest chain designs

• Indicates 0.5%, 0.75% and 1.0% chain wear to help identify the correct replacement point

• Helps protect cassettes and chainrings by identifying worn chains before excessive drivetrain wear occurs

• Ideal for routine bike maintenance and drivetrain servicing

General chain replacement guidelines:

• Single-speed chains: Replace at or just before 1.0% wear

• 5 to 10-speed chains: Replace at or just before 0.75% wear

• 11 to 13-speed chains: Replace at or just before 0.5% wear

*Always refer to your drivetrain manufacturer's recommendations where applicable.

Compatibility:

• 5 to 13-speed derailleur chains

• Single-speed chains

• Shimano® drivetrains

• SRAM® drivetrains, including T-Type and Flattop™

• Campagnolo® drivetrains, including Ekar™ 13-speed

FAQs

What does the Park Tool CC-4.2 Chain Wear Indicator do?

It measures bicycle chain wear, helping you determine when a chain should be replaced before it causes unnecessary wear to other drivetrain components.

Why should I check chain wear regularly?

Replacing a worn chain at the recommended wear point helps maintain smooth shifting and can significantly extend the life of your cassette and chainrings.

Which chains is the CC-4.2 compatible with?

The CC-4.2 works with most 5 to 13-speed derailleur chains, including Shimano®, SRAM® and Campagnolo® systems, as well as single-speed chains.