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Shimano - XTR Di2 RD-M9050 Rear Derailleur

Shimano XTR Di2 RD-M9050 Rear Derailleur

42% Off
$419.99 Original price:$719.99
Changing the size selection, or changing the selected color after selecting a size, may change the associated price

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    • Black, Medium Cage
      sale $419.99


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    Tech Specs

    [medium] 35t, [long] 46t (1 x 11), 42t (2 x 11), 40t (3 x 11)
    Cassette Range:
    [medium] 11 - 46t (1 x 11), 11 - 42t (2 x 11), [long] 11 - 46t (1 x 11), 11 - 42t (2 x 11), 11 - 40t (3 x 11)
    [medium] 1 x 11, 2 x 11, [long] 1 x 11, 2 x 11, 3 x 11
    Shimano XTR Di2 9050 systems
    Claimed Weight:
    [pair] 4.5oz (128g)
    Manufacturer Warranty:
    2 years
    mountain biking

    Why We Like The XTR Di2 RD-M9050 Rear Derailleur

    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 ability to calculate your efficiency, thus the M9050 can automatically shuttle your chain from cog to cog to set you up with the best chain line for any given situation. This technology also protects the short cage derailleur, by making sure you never run out of chain when cross-gearing. Moreover, Shimano’s E-Tube system allows you to program your preferences beforehand, so your drivetrain is calibrated just the way you like it. Of course, Synchronized Shift can be easily turned on and off as you please. The XTR Di2 RD-M9050 Rear Derailleur is compatible with Shimano’s resilient and hassle-free E-Tube wiring system.

    • Electronic XTR 11-speed rear derailleur for Di2 systems
    • Synchronized Shift offers automatic, progressive shifting
    • Shifting pattern can be programmed to your preferences
    • E-Tube wiring system provides fast response times


    • Familiarity: I've used it several times

    I was initially super stoked to try out the new XTR Di2 set up. What a disappointment. Two problems in five rides and now I can’t even get the shifter to work/charge/turn on. Called Shimano customer service and they told me take it to my local bike shop which is Two weeks out on appointments. It’s one expensive single speed now. I wouldn’t recommend this to Anyone. Can’t wait until I can get a SRAM set up installed.

    You just have a loose connection somewhere. Check all the plug ports and then you will be set.

    XTR DI2 = Scrap

    • Familiarity: I've put it through the wringer

    I've been a loyal Shimano XTR user for well over 20 years. DI2 finally changed that. I just ordered my first SRAM Eagle groupset. The idea of electronic shifting is great, and I love the DI2 for the road, but when it comes to mountain biking, DI2 is way too slow, with a lot of complicated double shifts, especially when you're on undulating terrain. I used my DI2 for just under a year -- maybe 1,200 miles. During that time, I had the another of the same frame set up with XTR mechanical. The performance and ride experience between the two was not even close, but I wanted to give DI2 a real chance, so I kept trying it. Last week, after racing the Tahoe Trail on DI2, I had my shop strip the DI2 and replace with mechanical derailleurs and shifters. Mechanical weighs less, it's faster; and you have more control of gearing -- and the constant beeping!! Yes, I am sure there's a way to silence it, but it drove me crazy and made me want to apologize to everyone else forced to listen to it. From the start I was annoyed with DI2's programming. I tried to have it reprogrammed to allow me to go to higher sprockets while on the small chainring. I was able to get an extra gear or two, but the thing was still constantly driving me to the large chainring. Then if you ever needed to immediately drop to a very low gear (maybe because you come around a corner and find a big obstacle or sudden hill), you've got to allow the computer to perform a bunch of shifts, including a front and rear simultaneous shift. Ultimately, the DI2 was allowing me to go through 4 or 5 sprockets on small ring. The rest was all large. If you're running that way, why even have a double? Shimano of course offers a single setup, but the range in the back is less than ideal for a larger rider doing endurance events, so, I started looking into SRAM, which offers a wider range with the Eagle groupset. It's on the way. This will be the first mountain bike I've ever owned without Shimano shifting, and I've owned a lot of them. Thanks, DI2, you suck!

    Great for CX 1x

    • Familiarity: I've put it through the wringer

    Really happy with this RD. I have it on a CX bike set up with a 1x and it works really well. I had a DuraAce RD with a RoadLink but the XTR clutch handles the big range much better without any chain issues.

    Super awesome !

    • Familiarity: I've used it once or twice and have initial impressions

    Have Dura Ace Di2 11-speed on the road steed, now rolling with it on my mt steed :) Total FYI - I am running a SRAM 10-42 cassette, SRAM chain, and SRAM Xo1 1X cranks with this - works flawlessly! I had many hesitations because I love the 1X drivetrain SRAM has to offer as well as the hill grinding 10-42 cassette. Setting up is waaaay easier then running cables, etc.
    Only hard part is, that depending on your frame, where to put the battery and wires. Pre-planning wiring and battery placement is a must prior to install. I have a 2015 Stumpjumper FSR 650b and was able to locate the battery in in the seat tube, just below the dropper post. For the short runs of wires that are exposed, I used electrical shrink-wrap tubing for a super clean look.
    Long term test to follow. I am familiar with the E-Tube set-up and set the rear derailleur to 'fast' - awesome. Also, if you run Di2 on your road bike, the front LED Display already has a junction box, so no need for that. Additionally - if you get the new FOX shocks, you can remotely actuate the shock setting with this stuff also - super crazy.