As a chain wears, shifting quality degrades and wear increases on the cassette. The Birzman Chain Wear Indicator Tool is an essential tool that quickly and accurately shows when your chain reaches 0.75% and 1% of wear. Many chain manufacturers recommend replacing a chain after 0.75% of wear. Features:User friendly toolMade from precision laser cut steelIntergrated chain hooks hold links during assembly and repairLightweight, quality product that's a must for all cycle enthusiasts
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