Sram's 1:1 ESP Actuation Ratio provides smooth precise shifting. 1:1 Actuation means for every 1 unit of cable pulled or released, the rear derailleur moves an equal amount. Provides a light shifting feel.

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The X.9 is a competition level derailleur. Made of Forged aluminum components. Sealed cartridge bearing pulleys. Works on 8 or 9 speed systems. Weight: 255g