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Shimano XT RD-M786 D.M. Shadow Plus Rear Derailleur
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Shimano XT RD-M786 D.M. Shadow Plus Rear Derailleur

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rating(5 customer reviews)
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MSRP: $103.99
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Designed to take abuse in stride.

With the RD-M786 Rear Derailleur, Shimano has refined shifting in all trail conditions, borrowing features from last year's XTR group, while adding compatibility with new direct mount frames.

The direct mount system allows the derailleur to sit about 25mm further back than previous designs, where it's less exposed to impacts along the trail. It also creates a stiffer interface between the derailleur and frame and allows for faster wheel changes, particularly on bikes using thru-axle systems. A pre-installed B-link allows for back compatibility with traditional derailleur hangers.

Another new feature is the XTR-derived Shadow Plus stabilizer switch which can be enabled to increase spring tension and eliminate chain slap. The low profile design allows the cage to easily clear obstacles like roots and rocks, and a longer arm length results in great mechanical mechanical advantage, essentially giving the shifter more control over the derailleur spring for crisp, reliable gear changes. Sealed pulley bearings keep out mud, dirt and grime.

The Deore XT RD-M786 Rear Derailleur is designed for Shimano Dyna-Sys 10-speed MTN drivetrains/shifters. Available in GS Mid-Cage or SGS Long-Cage models. Black finish. Actual weight: 257g (GS with B-Link).

Short Cage:

  • Maximum Sprocket: 36T
  • Minimum Sprocket: 11T
  • Front Difference: 18T
  • Total Capacity: 35T

Long Cage:

  • Maximum Sprocket: 36T
  • Minimum Sprocket: 11T
  • Front Difference: 18T
  • Total Capacity: 43T

B-Stock - This product has one or more B-Stock units available. These units can be purchased at a discount (see option select). B-Stock units were returned from other customers and may have missing or damaged packaging materials. These units are otherwise as new. The full manufacturer warranty applies. Click Here for more information.



Actuation: Mechanical 


Discipline: MTB 


Mount Type: Standard Rear Hanger 


Speed: 10 

Black - Medium Cage (GS)

Mfg PartNum: IRDM786GSL 

Black - Long Cage (SGS)

Mfg PartNum: IRDM786SGSL 


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5 stars
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3 stars
2 stars
1 stars
Stops dropped chain and slap!
by Joey
Cycling Enthusiast
San Francisco, CA
2 of 2 customers found this review helpful.

Running the GS version on a 1x10 (11-36T CS-M77 and a 32T RaceFace NarrowWide) and with the CN-HG94 chain sized by 2 full links and shifts are butter smooth even under load and no chain slap or drops going throughout the entire range. Great derailleur and kudos to Wester Bike Works for stocking it!

Reviewed 12/6/2013
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Worth every penny
by Anonymous
Competitive Racer
Atlanta, GA

Definitely worth the money. Shifting is so much better compared to the ZEE derailleur that I had before.

Reviewed 1/29/2018
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No more drop or skipped chains
by sportguy
Competitive Racer
markham park florida
2 of 2 customers found this review helpful.

Hint for set up Cable retaining bolt, before you tighten, I suggest just slightly pull cable taunt... Initially I was pulling to tightly,,maybe 1-2 mm and I could not find the happy zone for adjusting the high low screws...soooooo just pull cable snug and tighten bolt.

First ride I went out on purpose to throw or skip the chain and could not make that happen ( so it works )

Second ride I mistakenly forgot to engage the clutch,,,opps,,, WELL it did not matter,,,Chain tracked like a pro and accomplished what I had bought it for.

NOTE I also swapped out the triple crank and went with a single NARROWWIDE crank sprocket at the same time. Dropped 8 oz , cleaned up the cockpit and just simplified my ride.

Reviewed 4/28/2015
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OEM Products are the BEST
by Colo Dreamin
Cycling Enthusiast
Colorado Rockies

simple bolt on. replaced my derailleur which was bent. was on a 8 yr old Giant Anthem. easy to install. works great after the install.

Reviewed 7/21/2022
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The Shadow Plus RD is a rock solid product at a great price, no dropped chains all year in my group of riders
by k-squared
Competitive Racer
Denver, CO
2 of 3 customers found this review helpful.

the shadow plus has been rock solid in and around the front range in Colorado (lots of technical rocky accents and descents). Have also really appreciated not having to worry about losing a chain during several technical 24hr races (24hrs Colorado springs, 24hrs in the sagehartman rocks). Have yet to drop a chain since I went with the shadow plus. Would have paid 20% more for this product, all of my riding buddies are now on the shadow plus and might even use one to propose to my girlfriend over Christmas...

Reviewed 11/19/2012
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