Shimano
Shimano XTR Di2 RD-M9050 Rear Derailleur

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Shimano

Shimano XTR Di2 RD-M9050 Rear Derailleur

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Item #: RD218A00
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Shimano XTR Di2 M9050 Rear Derailleur

Focus and determination defines you. You are streamlined and efficient. You embrace the most difficult challenges and refuse to give up. You never make excuses, you never stop trying. You conquer mountains from the bottom up, never satisfied with only the descent. You crush the whole loop, every pedal stroke a relentless assault on gravity, your competitors and your personal records. You are XTR and XTR is you. Seriously fast. Confident. Experienced. XTR is committed to rewarding your every effort and has the pedigree to deliver. Dripping with performance, the XTR M9050 drivetrain will not only transfer every watt of energy from pedal to wheel, it will seamlessly shift between perfectly spaced gears allowing you to maintain critical rhythm and momentum over any terrain. You tell yourself you can race without XTR, but you won’t. Never second guess your first instinct.

Shimano XTR Di2 M9050 brings the legendary performace of Shimano XTR into the digital realm. Shimano's game-changing Di2 technology uses powerful digitally-controlled servo motors, which are built into the derailleur bodies, to deliver clean and accurate shifting, time after time. All Di2 componentry is sealed and waterproof, ensuring performance even in the most brutal conditions.

The Shimano XTR Di2 M9050 Rear Derailleur is the ultimate in rear derailleurs. With unrivaled chain control and shift performance that is consistent for the long-haul, the XTR Di2 M9050 Rear Derailleur is an engineering masterpiece that won't disappoint. The M9050 derailleur utilizes Shimano Shadow RD+ clutch technology, keeping chain tension in check over any terrain and ensuring accurate and responsive shifting no matter the conditions. Just like Shimano's mechanical mountain rear derailleurs, the XTR Di2 M9050 Rear Derailleur employs a low-profile geometry that keeps the rear derailleur out of the way of trail obstacles and reduces overall bulk. The XTR Di2 rear derailleur maintains constant communication with the front derailleur, so when used in Syncronized Shfit mode, the two work in perfect unison, creating an unparalled shifting experience. In the unlikely event that your Di2 battery runs out, the XTR Di2 rear derailleur remains in the last gear that was selected and can be shifted by hand to anywhere in the cassette, so you'll never get stuck riding back to the car in a suffer-inducing gear combination.

Shimano XTR Di2 M9050 Rear Derailleur Features:

  • Instantaneous shift response to rider input
  • Seamless gear changes
  • Shimano Synchronized Shift compatible
  • System communication with front derailleur
  • Advantage in all conditions
  • E-tube electric wire transmission guarantees stable performance
  • Low profile positions RD safely away from trail obstacles
  • Claimed weight: 298g
SHIMANO XTR M9050 Compatibility Chart

CALIFORNIA PROPOSITION 65 WARNING: This product can expose you to chemicals including (Cadmium, Phthalates, Bisphenol, Nickel (Metallic), di(2-ethylhexyl)phthalate "DEHP"), which is known to the State of California to cause cancer and/or cause birth defects or other reproductive harm. For more information, go to www.P65Warnings.ca.gov.

3 Ratings
4.3out of 5 stars
3 Ratings

Rated 5 stars by 67% of reviewers

Rated 4 stars by 0% of reviewers

Rated 3 stars by 33% of reviewers

Rated 2 stars by 0% of reviewers

Rated 1 star by 0% of reviewers

3 Reviews
Rated 5 out of 5
Oct 12, 2016
Never Misses a Beat
The derailleur perfected! Hard to say anything bad about it. If you ask it to shift, it WILL shift. Super smooth and silky, no hesistation, even when you're just banging through the gears under max power. It doesn't care. For max performance, it pairs especially well with the direct mount rear derailleur standard if you happen to have a frame that supports it.

My only gripe is that the clutch tensioner doesn't appear to work as well in the smaller cogs, e.g. when you're in your fastest gears and hauling down the trail, the clutch does less of what it's supposed to do. This is normal for most clutched derailleurs, but for XTR I just wish it was designed better. Even with maximum clutch tension applied the chain slaps a lot when I'm in my small cogs. And yes, my chain length is correct. All I can really do is live with it or slap a chainstay protector on.

It's also kind of noisy compared to the road Di2 derailleurs. I wasn't expecting this. For someone wanting utter silence, this derailleur is markedly louder than a normal mechanical derailleur, due to the stronger servomotors. It sounds like you're riding around with a robot, which is kind of rad. But it might annoy your riding buddies.

PROS: Shifts Perfect, Lightweight
Aaron
Rated 5 out of 5
Apr 28, 2021
Benchmark Performance
Di2 for MTB was the benchmark until Eagle and AXS came along. Still the reliable performance of Di2 is incredible and often is a tough decision to make even against 12 speed Sram. Di2 shifts your gears firmly into place even on powerful climbs at a low cadence. This derailleur is top notch and highly reliable.
Andrew Penksaw
Rated 3 out of 5
Jan 25, 2017
We are a Tandem team and ride hard. We shattered our original derailleur and replaced it with anew one. So far, so good.
Shaun D

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