Park Tool CC-4.2

• Chain Checker is a drop-in style gauge that measures bicycle chain wear.
• Accurately measures a long section of chain and strategically contacts the chain at three points, quickly and easily eliminating any guesswork when determining when chain replacement is needed.
• Works on any derailleur chain from 5 to 13 speeds (including SRAM® T-Type, SRAM® Flattop™, Shimano® XTR® 12-speed and Campagnolo® Ekar™ 13-speed chains) or single-speed chain, and is designed to accurately indicate when a chain reaches 0.5%, 0.75% and 1.0% wear, the points at which most chain manufacturers recommend replacement.

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