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  • Shimano XT M786 Shadow+ 10 Speed Rear Mech
  • Shimano XT M786 Shadow+ 10 Speed Rear Mech
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Shimano XT M786 Shadow 10 Speed Rear Mech

Shimano's new Direct Mount Rear Derailleur system gives more space around the rear frame dropout resulting in easier rear wheel removal but also allows frame designers to shorten chain stays, increase axel sizes and move suspension pivots.

Features:

  • Direct Mount gives a simpler, cleaner look.
  • Deore XT Shadow Dyna-Sys 10-speed rear derailleur delivers reliable and precise shifting with a stiff and lightweight open design.
  • Shadow features a super low profile design that reduces the risk of damage from trail side hazards.
  • Shadow Plus uses a chain stabilising switch that when on will reduce chain bounce in rough terrain maintaining more stable drive and shifting. This can be switched off to remove the wheel.
  • Direct cable routing prevents snagging from any trail side hazards.
  • All-alloy construction leads to lower weight without compromising strength and durability.
  • Four fluorine-coated link pin bushings make this one of the slickest shifting derailleurs on the trails.
  • High rigidity wide outer link braces the pulley body to increase pivot joint rigidity resulting in a crisp shift.
  • Strong return spring for a positive shifting feel.
  • Durable sealed bearing pulleys.
  • 35T capacity GS cage
  • Weight: 249g

Buy Shimano Components from Chain Reaction Cycles, the World's Largest Online Bike Store.

  • Colour: Black, Silver
  • Size: Medium Cage, Long Cage
  • Speed: 10 Speed
 
Rated 4.5 out of 5 by 43 reviewers.
Rated 4 out of 5 by Smooth and good shifting must buy this RD, smooth and good shifting, not that so noisy during shifting process 24 September 2014
Rated 5 out of 5 by Perfect indexing, Looks sexy, Never had any issues. Came as standard on my Zesty and only needed to replace as a friend fell off my bike, onto a rock and bent the lower arm. Even then it still shifted ok. 22 September 2014
Rated 5 out of 5 by Отличный переключатель по разумной цене. Использую этот переключатель со средней лапкой в системе 1Х10. Звезда Hope NW 32T, кассета Deore 11-34. Манетка ХТ. За месяц использования нареканий нет. Четкое и быстрое переключение по всему диапозону кассеты. Если хотите использовать расширители кассеты на 40-42Т, то это ваш выбор. 03 September 2014
Rated 5 out of 5 by Great bit of kit I've always used shimano since starting out in mtb, never failed me once & this product is no different. From the first day of installation I could notice the reduction in chain slap. Really good purchase. 23 August 2014
Rated 5 out of 5 by Good pruduct Buy this one to replace my "XT Shadow" that i've bended. work fine! the plus is worth the price difference, the chain is quieter, and my frame take less damage. 20 August 2014
Rated 5 out of 5 by Precise and quiet This is the first rear mech that I've had that uses Shadow+. I've immediately noticed how much quieter the chain is on rough sections. Works exactly as it should; couldn't be happier. 06 August 2014
Rated 5 out of 5 by great Good shifter, accurate changes. Not at all heavy, would buy this again if I had to make the choice. Very good on my trial run in Bedgebury 05 August 2014
Rated 5 out of 5 by Shimano all the way. Great derailer - chainslap minimised, good shifting performance. 04 August 2014
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18 Questions : 32 Answers

Product Q&A

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whats the difference between medium and large cage?
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Answer: 
Longer cage can be used with larger cassette sprockets
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Answer: 
The length of cage required is dictated by the number of chainrings you are running up front; a single or double crankset can use a Medium cage derailleur at the back, while a Triple chainset will be better matched with a Long Cage derailleur.
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Answer: 
Hi Ofir, it basically refers to how long the 'arm' is that holds the jockey wheels and it is dictated by the number [and size] of the front rings you're running. The length of the arm controls how far the rear mech moves when swapping cogs, for example, a DH bike with a single chainring with medium number of teeth can use a mech with short cage, whereas a triple chainring setup is likely require a long cage, etc.
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3 answers

Medium Cage on a 2 x 10 Set up?

Hi I am looking to buy one of these in a medium cage for a 2 x 10 set up (26/38-11/36), I was just wondering if the medium cage would work in all gear combinations or if I should buy a long cage? I currently run a long cage XT Shadow derailer.
Thanks, Brett.
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4 months, 1 week ago
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Answer: 
The medium cage XT rear mech works perfectly on a 26/38 front 11/36 rear. When installing remember to cut the chain so that when in 38 front & 36 rear the rear mech should point down vertically (i.e towards 6 o'clock).
In reality you can use all 20 gears, in practise it is very rare you use more than 5 (1 - 5) of the rear cassette when using the smallest chain ring, BECAUSE the larger chain ring gives such amazing performance. The small chain ring is really only needed for climbing a techy uphill sections any more than the first 5 and your in the wrong gear.
On this basis the medium cage is the best mech (XT with clutch) set up as described above...
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Answer: 
If this helps im using the 11-36 on rear and a 36 front and using the medium cage..works fine for me.
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Answer: 
Shimano list the RD-M786 SGS as having a maximum capacity of 43t, and the GS version as 35t.

Running a 26/38 and 11/36 gives you a capacity of 37 ((38-26)+(36-11)), so while you would be recommended the Long cage version, the Medium will likely be ok as well.
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Answer: 
If your gear shifter is Dynasys compatible then it will work - if it's compatible then you will see the Dynasys logo printed on the housing (White square with a black D in the middle of it).

Some SLX stuff is Dynasys compatible and some is not
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Answer: 
Yes you can use It. It's basically the same but with addition of the clutch system. Turn it ON to minimize chain slap, turn it OFF to work as per normal rear mech.
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Answer: 
yes
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Will size M cage work with the hope 40T casset ring
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Answer: 
Good question and no doubt topical. The answer is yes you can, but you may struggle running say a 38 tooth front chain ring and 40 tooth cassette . But if you use a 2 X front mech you will easily be able to run 24 /40. In my opinion if you want / need a 40 tooth cassette you are better of running a 2 X 10 (24/38 - 11/36). This with the rear mech is FANTASTIC in all locations. Shimano "know" & are not fashion led!
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Answer: 
The 40t sprocket is compatible with most medium or long cage 10 speed mountain rear derailleurs.
Typically you’ll need a long cage rear derailleur to use this setup on a 2x10 setup, while Medium should be enough for most 1x10 setups. You’ll want to double check your rear derailleur capacity; for a SRAM RD you can get away with a 14T difference in front rings (like a 28/42) and for Shimano you can manage a 12T jump (like a 28/40).
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Answer: 
Yes ordered size M and it all works no problems
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Answer: 
No. Operation of the derailleur will be blurry because the 9-speed shifter transfers the movement to a distance for 9-speed derailleur.
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Answer: 
NO!
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Answer: 
Absolutely!
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Answer: 
Yes; with the exception of the M800 Saint rear derailleur, all Shimano MTB derailleurs mount via a standard 10mm connecting bolt attached to your gear hanger.
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2 answers

8 speed setup?

I realise there is no indexing in the mech itself, so the shifter controls the movement of the mech. I would like to fit these to some 8 speed shimano muck around bikes I have. They will both be 11-30 cluster, 22/32 chainrings. One will have a sram cluster which will apparently work with the existing setup.
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Answer: 
Unless you're able to adjust the indexing on your trigger to match the indexing on the rear mech then it won't work
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Answer: 
As this mech is designed to run on a 10-speed drivetrain; the cage itself is spaced for a narrow 10-speed drivetrain; in relation to running this with an 8-speed system and shifting over the cassette would not be mechanically possible.
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Answer: 
Shadow+ only for 10 speed systems,
you can try to combine rear derailer Shimano shadow+ with 9-speed Sram shifter,
they must be the same gear ratio
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Answer: 
Possibly! However you know in your heart the only solution is to match product i.e 10 speed with 10 speed, not 10 speed with 9 speed parts. The problem will be the chain. A 10 speed chain on a 9 speed cassette or visa-versa may work but not properly.
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Hi,

Will this 10 sp work with the crank set SLX M660 with the tooth 44/32/22?

Thanks
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Answer: 
Yes, no problem
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Answer: 
Hi Yes it would work fine with the SLX crank set as its Dyna-Sys component as well.
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I have a front double XT chain set 40-28 with a 11-36 cassette on the rear please can you advise me on which rear derailler I need a long cage or medium cage
Thanks Simon
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Answer: 
Medium cage for trail riding is best. When installing chain make sure when in the big chain ring (40 front) & big ring rear (36) that mech is not pulled too tight and middle jockey wheel runs free. I use 38/24 with 11/36 with medium cage which runs like a dream.
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Answer: 
Hi!
You need a long cage.
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