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Essential tool for the avid cyclist - save money by replacing your chain at the right time sparing your chain rings and cassette! Read more..
Helps you decide when it's time to change the chain - if your wear is above 0.5 (10, 11,12-speed) or 0.75 (7/8/9-speed) it's time for a new chain! You can run single speed or IGH chains to ~1.0 wear.