CC-4.2 5-13 Speed ​​Chain Checker - Park Tool

The chain checker is a drop-in type gauge that measures the wear of the bicycle chain.

It accurately measures a large section of chain and contacts it at three strategic points, quickly and easily eliminating the uncertainty of when chain replacement is needed.

It is compatible with all 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 fixed gear chains. I

It is designed to accurately indicate when the chain reaches 0.5%, 0.75% and 1.0% wear, the points at which most chain manufacturers recommend replacement.