Park Tool Chain Checker Bicycles First to introduce to the

First to introduce to the market

Pronged toe-clip: Simple

Integrated camera window

making the Sentry™ Aero 260 visible from nearly any angle

Park Tool Chain Checker Bicycles First to introduce to theThe 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