When we're outfitting our dream race bike, we opt for the best when it comes to mechanical shifting. Shimano's M9000 XTR Rear Derailleur is the top-of-the-line offering for Shimano's 11-speed mountain bike drivetrains. It's capable of handling cogs up to 46 teeth, and can be set up in 1 x 11, 2 x...

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