PARK TOOL CC-4 Chain Checker Silver

The Cc-4 Is A Drop-In Style Gauge That Measures Bicycle Chain Wear. The Laser Cut Cc-4 Accurately Measures A Long Section Of Chain And Strategically Comes In Contact With The Chain In Three Places, Quickly And Easily Taking The Guesswork Out Of Knowing When Chain Replacement Is Necessary. A Worn Chain Will Cause Poor Shifting As Well As Accelerate Drivetrain Wear. The Tool Works On Any 5 To 12-Speed Derailleur Chain (Including Sram® Axs®) And Is Designed To Accurately Indicate When A Chain Reaches .5% And .75% Wear, The Points At Which Most Chain Manufacturers Suggest Replacement.