Park Tool Chain-Wear Indicator

Park Tool Chain-Wear Indicator
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Park's Chain-Wear Indicator keeps your drivetrain running smoothly by telling you when it's time for a new chain. A worn chain shifts poorly and wears the cassette cogs and chainrings faster. The gauge accurately indicates when a chain reaches 3/4 and 1% wear, the points at which most chain manufacturers suggest replacement.

WARNING: Cancer and Reproductive Harm