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Shimano XT RD-M8000 11SP Rear Derailleur

Item #: RD212A03
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Shimano XT RD-M8000 Rear Derailleur

The long-awaited Shimano XT 11 speed drivetrain has made its grand entrance! Featuring Shimano's innovative Shadow Plus technology and a refined geometry, the Deore XT M8000 11-speed rear derailleur is designed to reign authority over today's aggressive style of trail and all-mountain riding. By maintaining chain tension, the optimized slant angled Shadow system eliminates chain slap and greatly lowers the chances of dropping your chain. The easy-to-adjust chain stabilizer makes it quick and effortless to dial in the perfect amount of stability for varying conditions and terrain.

The XT M8000 rear derailleur employs a new hyper low-friction coating technology and an improved pulley design that greatly lightens up the shift operation, allowing up to 20% less effort. Finally, support for larger rear clusters is offered as well, with clearance on up to 11-46T rear cassettes for massive range.

Don't know which cage length to choose? Choose a long cage "SGS" derailleur if you have 3 chainrings on your crankset, and a medium cage "GS" if you have 1 or 2 front chainrings.

Shimano XT RD-M8000 Rear Derailleur Features:

  • Light shift operation with 20% less effort
  • Efficient shifting and smoother driving
  • Easy-to-adjust chain stabilizer (uses a 2mm allen)
  • Chain stability improved
  • New shadow design with optimized slant angle for stable gear position
  • Efficient pulley teeth design

Specifications:

  • Model Number: RD-M8000
  • Series: DEORE XT
  • Shifting Action: SHADOW RD+
  • Mount Type: Direct attachment (Conventional) / Direct mount compatible (for compatible frames)
  • Maximum Sprocket: Low sprocket: 40/42T** Top sprocket: 11T **46T for 1x11 only
  • Minimum Sprocket: Low sprocket: 40T Top sprocket: 11T
  • Front Difference: Maximum 10T (GS), Maximum 18T (SGS)
  • Total Capacity: 39T (GS), 47T (SGS)
  • Compatibility: GS - Shimano 2x11 and 1x11 speed drivetrains, SGS - 3x11 drivetrain
  • Weight: 272g (GS Cage)

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.

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4.8 / 5.0
397 Reviews
5 Stars
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1
Precise shifting, great chain management
I replaced my SRAM X1 rear derailleur with this one on my 1x11 drivetrain and the shifting is so much better! No compatibility issues with the SRAM 10-42 cassette and the shifting is more precise. The clutch system on the XT derailleur is also much stiffer than the SRAM X1 derailleur, so the chain is even more securely managed. Easy swap and great upgrade.
May 17, 2016
Location:
Phoenix, AZ
Excellent Value!!
I bought this derailleur to replace my aging 3x9 sram system. All I can say is WOW! Along with the XT shifter, 11-46 XT cassette and an oval 32 tooth ring up front, this system is nearly silent. No more dropped chains. No more chain slapping about my chain stay. Shifting is precise. If you are still on the fence about going to a 1x setup, this shimano setup will blow you away with its price to performance ratio! Setup is very easy. I was amazed at how simple and snag free the installation went.
February 22, 2017
Purchased
 over 3 years ago
Location:
CO Front Range
Doing a nice job with my 11/42
Working well with my very large gear range 50/34 front and 11/42 rear hybrid setup. Long Cage SGS version. 47T total capacity. Slightly clunky in the big chain ring upfront and the top 3 rear sprockets but it works. I'm sure it would be fine with a 1x setup or any lesser gear range.
September 22, 2016
Location:
Boulder CO
Really love the shifting of this Derailleur!
Upgraded my 2x10 drivetrain to a 1x11 . Paired the XT Derailleur with the 11-42 XT cassette, XT shifter, a KMC chain and a Race Face NW 32T chainring. Overall love the setup and would recommend it if you're looking to go the 1x11 route. Plus Jenson's prices made it possible for a very reasonable price!
December 22, 2017
Purchased
 over 2 years ago
Location:
Silver lake, Wi
Great 11 speed derailleur
This is a great derailleur I have the long gauge SGS it worked well with my 50 tooth to 11 tooth 11 speed sprocket. The clutch helps keep the chain slap to a minimum. The only downside is it hangs lower thus making it more likely to be ripped off. The last one lasted 2 years before I snapped It Off.
October 10, 2018
Purchased
 1 year ago
Location:
The mountains of Colorado
Works with 11-50 cassette
Great derailleur that works with a 11-50 Sunrace cassette (SGS) without any extended hanger or long b screw. Shifts well and made my 1x conversion work!
October 25, 2018
Purchased
 1 year ago
I love this derailleur!
Quick delivery in a well packed box. Site works great.
August 21, 2016
Location:
New Hampshire
Nice
Nice upgrade from SLX, works perfect with XT cassette.
March 29, 2017
Purchased
 over 2 years ago
Great 1x11 Derailleur!
Easy to set up, looks great and shifts smooth. It was a good purchase for me!
October 9, 2017
Purchased
 over 2 years ago
Location:
Kansas
It's Shimano and it's XT, of course it works well.
Used the M8000 suite to finally get around to a 1X swap. It's more of an observation than a complaint but the shifting is a little stiffer/notchier than the older SLX der. it replaced but it works flawlessly with a Sunrace 11-50 wide range. I guess technically you could just say it's more crisp. It also shifts into the 50T just fine and will backpedal without any trouble or maxing out the B-screw.
May 7, 2018
Purchased
 1 year ago
Location:
Texas

Q & A

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Browse 29 questions Browse 29 questions and 93 answers
Will this rear derailleur work with a 10spd cassette? specifically the sunrace MX3 11-42 10-speed for a 1x10?
A shopper on Jun 6, 2017
BEST ANSWER: This derailleur is designed for use with 11 speed cassettes.
Will it work with an XT RD-M8000 derailleur?
A shopper on Jun 4, 2017
Shimano XT RD-M8000 11SP Rear Derailleur GS Cage, Medium Cage, 1X/2X Drivetrains
Shimano XT RD-M8000 11SP Rear Derailleur GS Cage, Medium Cage, 1X/2X Drivetrains
Shimano Rear Derailleur Bracket Axle Kit XT M786/781, SLX M675/670 & Deore M6
Shimano Rear Derailleur Bracket Axle Kit XT M786/781, SLX M675/670 & Deore M6
BEST ANSWER: According to the tech docs the 11-speeds have a different part number than the 10-speed versions. I would look to order the right one. The XT M8000 P/N appears to be Y5RT98010.
works with Shimano 11-speed derailleur?
A shopper on Aug 20, 2018
Shimano XT RD-M8000 11SP Rear Derailleur GS Cage, Medium Cage, 1X/2X Drivetrains
Shimano XT RD-M8000 11SP Rear Derailleur GS Cage, Medium Cage, 1X/2X Drivetrains
SRAM GX 11 Speed Trigger Shifter Black, Rear, SRAM X-Actuation
SRAM GX 11 Speed Trigger Shifter Black, Rear, SRAM X-Actuation
BEST ANSWER: Generally, SRAM rear shifters only work with SRAM rear derailleurs. Front 2x setups typically will work with a mixed SRAM/Shimano set. If it were me, I would not mix a shifter from one company and a derailleur (front or rear) from another company. You are inviting problems with alignment and adjustments.
How do I know if I need GS or SGS cage if upgrading a Trance from 2x10 to 1x11?
scott f on Jan 2, 2017
BEST ANSWER: Hi Scott, actually I had the same doubt weeks ago and an expert told me that if you have a cassette 11/42T you can get a GS model, however if you plan to get a 11/46T you will need a longer cage, in this case SGS. Hope it helps clarify. RIcardo
I am running a 30t single narrow/wide chainring up front will the gs cage work an 11-42 cassette?
Shawn bear on Jun 4, 2017
BEST ANSWER: Yes it will work. I have that setup on one of my bike and works great! Have Fun!
My goal is to go 1x11 with a 32 front oval ring and the 11-50 Sunrace cassette. Will the medium cage still reach that or should I go long cage to be safe?
Chase C on May 23, 2017
BEST ANSWER: The cage length isn't really the limiting factor, it's the actual P-knuckle design of the XT derailleur. When you play with gearing that lies outside the spec limits of the derailleur you risk catastrophic damage to the derailleur and possibly your frame. You may wish to upgrade your derailleur to vastly improve the shifting with the WolfCage. It is sized for 49T conversions but a 50T is not much bigger and should shift fine.
Wolf Tooth Wolfcage For Shimano
Wolf Tooth Wolfcage For Shimano
What rear derailleur is best for 2x11 set up, GS or SGS? Chain rings are 22T and 36T, cassette is 11-46T or 11-50T. Thanks.
Alex R on Oct 11, 2017
BEST ANSWER: I run a 2x11 set up with 22/36 rings and a 11-42 cassette and the long cage SGS rear mech is absolutely fine
Will this work with 105 11spd road shifters on a cross/gravel bike with a 34/50 front?
A shopper on Jan 30, 2018
BEST ANSWER: Im told this would work with some modifications. First I would probably invest in a Wolf tooth goat link and you will need a tanpan , which optimizes shifting between road shifters and mountain derailleurs.
I have cassette 11-42T (11v) and crankset 22-36T. What kind of cage do they recommend?. Thanks
vejar on Sep 21, 2018
Shimano XT RD-M8000 11SP Rear Derailleur GS Cage, Medium Cage, 1X/2X Drivetrains
Shimano XT RD-M8000 11SP Rear Derailleur GS Cage, Medium Cage, 1X/2X Drivetrains
Shimano XT CS-M8000 11 Speed Cassette 11-46T, 11 Speed
Shimano XT CS-M8000 11 Speed Cassette 11-46T, 11 Speed
BEST ANSWER: GS cage, is for 2x, and up to 42t cassette.
I have a crankset 36/22 and cassette 11-42T of 11 speeds. What size of cage they recommend. Shimano says that GS is for 1x and 2x. SGS for 3x. But with the formula of total capacity gives 45T recommends SGS?
vejar on Aug 22, 2018
BEST ANSWER: Long cage for 2x and 3x.
Medium cage for 1x.
I am replacing a Shimano XT 10spd Rear derailleur and 11-36 cassette on a 1x10, to a Shimano XT 11spd with 11-42 cassette. From reading it looks like the medium cage will work but will i need any other extensions to make this compatible? Its going on a 2013 Scott Spark 910 if that makes any difference. thanks
A shopper on May 10, 2017
BEST ANSWER: On a Bronson 2015 (not the current model), I went from an 11-36 10SP XT, 2x10. Upgraded to 1x11 XT with 11-40. Can't speak to the Spark specifically but believe the driver / hub will accommodate 11sp. They basically moved everything closer together and thinned out the chain. Don't forget the 11sp shifter and you might want to think about a bigger narrow/wide chain ring if you want more top end speed OR keep the current one for better climbing. Medium cage should work up to 11-46. Hope this helps.
Will this xt rd - m8000 rear der work on sunrace wide cassettes 11-46t ?
A shopper on Oct 26, 2017
BEST ANSWER: I am using it with this cassette and derailleur and it works great with a raceface 32t front.
I have a 30 in the front 11-46 in the back...wich derailleur should I use, sgs or gs?
A shopper on Jul 15, 2017
BEST ANSWER: GS cage (medium) should be the right one. With a single chainring you don't have to account for any front diameter change. If you had a triple chainring setup, an SGS would be needed.
hi this is model 2017 or 2016? thanks
anuar david on Apr 17, 2017
Shimano XT RD-M8000 11SP Rear Derailleur GS Cage, Medium Cage, 1X/2X Drivetrains
Shimano XT RD-M8000 11SP Rear Derailleur GS Cage, Medium Cage, 1X/2X Drivetrains
Shimano XT BR-M8000 Disc Brake Black, Left Hand Lever, Front
Shimano XT BR-M8000 Disc Brake Black, Left Hand Lever, Front
BEST ANSWER: There should be no difference between 2016 and 2017 version as long as the Model name's the same.
Is the GS derailleur compatible with the 46t XT CS-M8000 cassette, or is a longer cage derailleur needed?
Tyler L on Apr 17, 2018
BEST ANSWER: GS works fine w/ Shimano or Sunrace 11/46, I have one on my Fat bike. I can’t post a link here but if you search for Shimano product info on the web you can see the RDR specs and 11/46 is called out as compatable with the GS.
Im building an off road touring bike. Can I run a 24/34 (boost) front with an 11/46 rear? If possible do I use a short or long cage?
A shopper on May 5, 2017
BEST ANSWER: The medium cage works well for a 1x11 and for some 2x11 systems that use smaller front and rear gearing sizes. In your case, I think you would need to use the long cage version, as when the bike is in the smallest gear front and rear, you will have a pretty long length of chain to gather up and keep tight. You will likely need a longer chain than the standard 116 links also, but that could be influenced by frame size. Use the chain length measuring guide that ships with the derailleur to be sure.
work with Shimano 11-speed derailleurs?
vejar on Aug 20, 2018
Shimano XT RD-M8000 11SP Rear Derailleur GS Cage, Medium Cage, 1X/2X Drivetrains
Shimano XT RD-M8000 11SP Rear Derailleur GS Cage, Medium Cage, 1X/2X Drivetrains
SRAM GX 11 Speed Trigger Shifter Black, Rear, SRAM X-Actuation
SRAM GX 11 Speed Trigger Shifter Black, Rear, SRAM X-Actuation
BEST ANSWER: It will not work. You have to use a Shimano shifter.
I'm running a 1x11 with a 30T up front. I bought the long cage. Is that okay?
Mark Smith on Jun 28, 2018
BEST ANSWER: In researching a similar set up a while ago i recall the long cage being the right choice. Read up on the proper alignment of your 30T relative to the 1x11.
Will GS cage work with 11-46 cassette?
Aaron T on Jun 11, 2018
BEST ANSWER: I'm using a GS cage with 11-46T cassette and it seems to be working just great. Don't forget to completely readjust your derailleur including high, low, and b-tension adjustments.
Just bought the shimano11-46 casette, which derailleur is compatible with this?
Tim C on Apr 19, 2018
BEST ANSWER: 11- speed long cage will be compatible.... Most brands do have matching sets these days so look at what they are selling as a combo kits... This will help you decide better....
Will it work with an e-thirteen 9-46t cassette?
Luisfer on Jan 13, 2018
BEST ANSWER: I have the medium cage version working with both a Shimano M8000 11-46 and a Sunrace 11-46. I run a 34t single Renthal front ring. Medium cage is right for that. If you run a 32t or 30t chaining, you might want the long cage version to take up a little more slack. Jenson tech support should know for sure

Bob T.
I would like to run this on my Cyclocross bike with a wolflink tanpan. Would this work with a 46/36 chainset and a 11-28 cassette?
Steven H on Feb 3, 2018
BEST ANSWER: It will work. So will a regular road derailleur. Only difference would be the clutch. I would use a short cage ultegra derailleur. A mid cage will work up to a 11-32
Will this work with the Sunrace 11-50T cassette? GS or SGS?
JackC on Dec 13, 2017
BEST ANSWER: I am using the SGS on a 1by setup with 50t cassette and longer b screw. a little worrying slack in the 11t and a lttle worrying lack of teeth grabbing in the 50t, but it's been working okay if not optimal. Likely switching to 46t as soon as.
Will SG work on an 2 X 11/46 ?
JOAQUIN C on Nov 18, 2017
BEST ANSWER: I used it on a 1X set up but the cassette was 11X46 so it should be fine
I am running a 2X crank 48-34. Can I run 11 to 34 cassette?
A shopper on Oct 9, 2019
BEST ANSWER: Yes you can. I run something similar and it works great--46-34 crank and 11-34 cassette on a gravel bike. I use a Tanpan to make the XT derailleur work with Ultegra brifters.
Will sgs cage work with 11-46?
Person P on Aug 20, 2019
BEST ANSWER: Only use SGS cage if using a crankset with multiple chainrings. Have been using GS cage on 11-46t with single 30t chainring.
If I am currently running a 1x11 (11-46) but may go back to a 3x11 can I still run the SGS on just the 1x11 setup? I’d prefer to have the ability to swap and not buy another long cage in the future
Matt S. on Jul 15, 2018
BEST ANSWER: I had no problems with the long cage sgs and 1x 11/46, one bike I had to get a different / longer b tension screw and another bike didn’t
So what bike you have may have some impact on adjustability

Brady
What is the actual cage length (pulley to pulley) of the GS versus SGS? The derailleurs are only marked "RD-M8000" and have no "GS" or "SGS" markings to identify themselves.
ridgerunner on Jul 14, 2018
BEST ANSWER: If you have a 46t or higher cassette you need a SGS or long cage. Everything below that (11-36/11-42) a GS or medium cage is recommended. Check what your cassette gearing is and that should tell you what you have.
Hello, what does the designation "Front Difference: MAX 10T" mean? Is that relevant only to 2x systems? If I want to have a 1x system with a 28T front chainring and the 42T cassette on the back, is that possible?

Thank you!
The Experiment on May 6, 2016
BEST ANSWER: Yes, that refers to the front chainrings and has no bearing on 1x systems.

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