Shimano Deore XT RD-M772 Rear Derailleur

DESCRIPTION

The NewShimano Shadow Rear Derailleur places priority on a low profile design for ridersThat are at home onTechnicalTrails.The derailleur has a profileThat is a full 15mm narrowerThan aTraditional rear derailleur.That means it does not protrude morethanThe quick release skewer nut.Top normal spring designTo mesh withThe more common choice of RapidFire shifters forTrail/all-mountain riding Direct cable routing reducesThe chance ofThe cable snagging on roots and rocks Stronger spring keepsThe dera

USER REVIEWS

Showing 1-10 of 26  
[Apr 12, 2021]
Restornation555


OVERALL
RATING
4
Strength:

Shifts up and down quite smoothly Good sealed bearing pulleys Decent under pressure

Weakness:

A little too flexy for an XT derailleur The X design and less material make it weaker therefore causing less precise shifting Sometimes skips between gears on when medium pressure is applied

Purchased:
Used  
[Sep 27, 2013]
TahoeBC

OVERALL
RATING
1
VALUE
RATING
3
Strength:

Shifts well

Weakness:

parallelogram bends way to easy, very weak

I recently went with the Shadow/clutch version primarily cause I was bending a lot of hangers in rocky terrain. Found I really dug the clutch feature also. Found it to be a very good Derailleur and had not problems setting it up and got perfect shifting from it. I might note that I was using a nine speed Sram drivetrain with a 6mm spacer on the cable attachment point, this works great.

Anyway even though it probably takes less rock hits with the shadow technology, it cannot handle a hit to a rock well at all, I killed two of these Derailleur's in a month. The parallelogram becomes so distorted it cannot be repaired. I'm now running my 6 year old SRAM XO Derailleur that I have had to replace around 5 hangers a year on, it can take a beating.

Its to bad I had high hopes for this thing, as long as your not riding very rocky terrain, you will probably be happy with it, for me I cannot afford to keep buying new Derailleur's.

[Jan 19, 2013]
mp187regs

OVERALL
RATING
2
VALUE
RATING
2
Strength:

Quiet shifting, nice and light.

Weakness:

Difficult to setup and keep setup.

Bought this in October, and it has been a pain to keep properly setup. I attributing some of this to the new cable routing on it which on my bike required the rear shift cable housing to go in awkward loop from the rear triangle to the derailleur. I tried different length housings and two cables to no result.

At first I had trouble with it not dropping out of the big ring in the back and usually I could kick it with my back foot to get it to shift, I got that resolved. Then I always had shifting problems, I could get the bike to shift perfectly in the work stand, and would do a couples miles on the road and it would shift perfectly. On the trail it would shift fine then after a little bit I would start having problems.

I eventually got tired of it and bought a new in box older model XT deraillure and so far no shifting issues after setup.

[Nov 06, 2012]
Alexander
Cross Country Rider

OVERALL
RATING
1
VALUE
RATING
2
Strength:

Neat design.

Weakness:

First time I had to read manual on order to adjust a derailleur!
I never made it to work with all 3 chainrings :/
It's either the granny or the biggest one. Or just the middle one, but not all 3.
Read FAQs forums, techtips - nada.

Good intention, but very poor design.

[May 19, 2012]
Henrik B

OVERALL
RATING
4
VALUE
RATING
5
Strength:

Precise shifting. looking good. Fairly light. Easy to adjust. Good for xc.

Weakness:

Not the strongest on the market

Ive had this since april 2008. Wore it out and bought a new one 3 month ago. True it is vulnarable, but i like the smoth shifting and the price tag.

Similar Products Used:

SLX and XTR in the same series.

[Feb 05, 2012]
2004_sj_pro
Cross Country Rider

OVERALL
RATING
1
VALUE
RATING
1
Strength:

None that come to mind.

Weakness:

Poor engineering.

Absolutely one of the worst derailleurs I've worked with. Setup on this thing took forever, and it seemed like no matter what minute adjust I made, it would go out of adjustment at some other point (e.g. slightly loosen b-tension screw to allow for quicker downshift [which i could never get to happen] and then the high/low goes way out of whack.

I honestly think this thing has been over-engineered and the result is that it has ventured into unfriendly territory as far as the end user is concerned. I can't say I'm a big fan of the sharp angle where the cable exits. Seems like a perfectly good point for the cable to get worn and eventually snap.

Normally, it has taken me about 10-20 minutes to dial in a rear derailleur, and the end result being buttery smooth shifting, up and down the range. This thing was just all over the place. Set the chain on the largest chainring, thought it was dialed in, then shifted down to the middle chainring, only to have it stick before wanting to shift up/down. Totally unpredictable, which is absolutely the last thing you want out on the trail.

Similar Products Used:

XTR, XT derailleurs

[Aug 15, 2010]
MTBOaxaca
Cross Country Rider

OVERALL
RATING
5
VALUE
RATING
5
Strength:

Low weight, Less likely to get hit or bend your derailleur hanger, shifts good.

Weakness:

Not at this time......

This is the best option at the present time for riding areas with deep ruts, rocks, and tight lines. I've had many other derailleur strikes and bent hangers using the normal non shadow design. This design works good! Some have written about shifting issues but I've had none. Get it set and it does the job fine. I'm hoping SRAM will have an option like Shimanos Shadow RD soon.....

Similar Products Used:

All other shimano non shadow style 7,8,9 speed (LX,XT,XTR) and some sram rear derailleurs.

[May 22, 2010]
wazmo
Cross Country Rider

OVERALL
RATING
1
VALUE
RATING
2
Strength:

Low profile, shifts well when adjusted

Weakness:

Grabs sticks, mounting arm bends easily, constantly needs re-adjustment

Does not live up to previous xt durability

Similar Products Used:

XTR non-shadow, SRAM x-o

[May 20, 2010]
Richard 77
Weekend Warrior

OVERALL
RATING
3
VALUE
RATING
5
Strength:

Shirts great. Easy to adjust

Weakness:

Shift cable breaks every 3 to 6 months

A buddy and I both have the same bike & set-up using the "new" shadow XT derailleur. It shifts very smoothly, but the cable breaks after about 500 miles of serious mountain biking. When doing lots of shifting. Both of us have to replace the cable every 3 to 6 months depending on how much we ride. It breaks at the rear bolt where the cable attaches to the derailleur. The cable bends very slightly back and forth while shifting (like you would do to snap a coat hanger wire). It is not a straight pull. People I know who ride up hill on varied terrain and do a lot a shifting have the problem. Don't shift a lot? Then it will probably last a long time. I have gone through 6 or 7 cables in 2 years. XTR replacement cable lasts longer than the generics I tried.

Similar Products Used:

older XT, XTR

[Apr 24, 2010]
Anonymous
Weekend Warrior

OVERALL
RATING
2
VALUE
RATING
3
Strength:

Less exposed cable routing is well designed. Looks cool. Shifts nice but not as clean and fast as my old XT's.

Weakness:

I have been trail riding for over 25 years and this derailleur is a stick magnet. I think it is due to the vulnerable extended cable arm. I have enough experience to know when to avoid sticks and when to stop if one jams into the unit. I have both bent and broke the mounting bolt already after 3 hard rides. I'm leery of the future of this design. This maybe good for slick rock, arid climate riders but go in the woods and you WILL eventually break this part.

If I can't fix this "designed to shear" mounting bolt, I'm replacing this with a conventional XT design or maybe trying a SRAM.

Similar Products Used:

Always XT or XTR

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