A worn chain will cause poor shifting and accelerate drivetrain wear. The laser cut CC-4 is a drop-in style gauge that accurately measures a long section of chain in three places, quickly and easily taking the guesswork out of chain replacement.
 
Drop-in style gauge
Laser cut
Measures across three reference points
Takes guesswork out of chain replacement
Compatible with any 5-12 speed derailleur chain (including SRAM AXS)
Indicates when a chain reaches .5% and .75% wear