The BBB ChainChecker Multifunction Chain Wear Indicator is easy to use:
- When the tool displays 0.75 = 75% wear, the chain must be changed soon
- When the tool displays 1.0 = 100% wear, the chain must be replaced immediately
- Built-in chain hook keeps the chain in place during assembly
- A 5/6/8mm valve tool and hex keys complete this unique mini-tool
- Compatible chains: 7 to 12 speeds
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