KMC - SPROCKET CHECKER

The KMC Sprocket Checker is a wear indicator to asses the rear sprocket condition and avoid chain slip on worn sprockets. For use with 12 - 21 tooth sprockets.

1 - Place the checker's chain on the sprocket with the bottom rounded end of the handle between two teeth and the test link angling away from the sprocket.
2 - Apply about 10kg of force onto the handle in the direction of the sprocket/drive rotation. While the checker chain is under load, swing the test link into the sprocket.
3 - If the test link easily moves onto the tooth's bottom, this means the sprocket is in good condition.