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Shimano XTR M986 Shadow Plus Rear Derailleur
Shimano's M986 XTR Shadow Plus rear derailleur is a game changer. The innovative Shadow Plus rear derailleur allows you to virtually lock out the pulley cage using increased tension to eliminating chain throw, chain slap, and extraneous drivetrain noise -- in other words the drivetrain issues you have while riding rough trails at high speed. The built in On/Off switch and included adjustment tool allow you to customize pulley cage tension and also help facilitate removal of the rear wheel. Combine that with the unobtrusive Shadow derailleur profile, improved cable pull ratio and sealed top and bottom pulleys and you get the paragon of all-mountain derailleurs.