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

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The RD-M786 Rear Derailleur ushers in Shimano's new direct mounting system and incorporates the XTR group's Shadow Plus technology while offering the same impressive blend of performance and durability that riders have come to expect from XT.

The direct mount design is compatible with newer frames from some of the cycling industry's leading manufacturers while remaining back-compatible with traditional hangers. This feature 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.

The XTR-derived Shadow Plus system adds a stabilizer switch which can be enabled to increase spring tension and eliminate chain slap over rough terrain. Once disabled, the switch slackens back to standard spring tension, allowing for quick and easy wheel removal. Like last year's standard Shadow model, the Shadow Plus cage is tucked out of the way, furthering the derailleur's ability to clear trail obstacles like roots and rocks.

Also like its predecessor, this XT derailleur uses a slightly longer arm length for greater mechanical advantage. This gives the shifter more control over the derailleur spring for crisp, reliable shifting in all conditions. And of course, low maintenance 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. A removable B-Link is pre-installed for compatibility with standard derailleur hangers. Black finish. Actual weight: 257g (GS with B-Link).

Medium Cage (GS):

  • 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
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Reviewed 4/28/2015
by sportguy
Competitive Racer
markham park florida
Value Rating
Overall Rating
2 of 2 customers found this review helpful.
No more drop or skipped chains

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.

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Reviewed 11/19/2012
by k-squared
Competitive Racer
Denver, CO
Value Rating
Overall Rating
2 of 3 customers found this review helpful.
The Shadow Plus RD is a rock solid product at a great price, no dropped chains all year in my group of riders

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...

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Reviewed 1/29/2018
by Anonymous
Competitive Racer
Atlanta, GA
Overall Rating
Worth every penny

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

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Reviewed 12/6/2013
by Joey
Cycling Enthusiast
San Francisco, CA
Overall Rating
2 of 2 customers found this review helpful.
Stops dropped chain and slap!

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!

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