On top of delivering smooth, effortless shifting in all conditions, Shimano's XTR Di2 RD-M9050 Rear Derailleur will make the aft-end of your drivetrain smarter than it's ever been before. With Shimano's Synchronized Shift technology, the front and rear derailleurs operate in sync and have the...

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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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With the release of the XTR M9100 12-speed drivetrain, Shimano jumps right back to the front of the pack by expanding the available gear range and offering better shifting performance than ever before. The new XTR RD-M9100 Rear Derailleur is specifically optimized for Shimano's new wide range...

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Shimano may have taken its sweet time when jumping into the world of 12-speed, but patience is a virtue, and it seems like our wait was certainly rewarded, as its new XTR 12-speed groupset soars right back to the front of the cutting edge, while offering even better shifting performance than...

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Chain slap is something we all have to live with, but Shimano's ZEE RD-M640 Shadow Plus makes it a whole lot less cringe-inducing by including its now-famous clutch technology. By increasing spring tension when it's engaged, the clutch reduces slap and the risk of dropping a chain, making it a...

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