SHIMANO Deore XT Shadow Mountain Bicycle Rear Derailleur - RD-M772

This replaced a worn out Deore XT which from the beginning drove me crazy when on the smallest cog it would bounce down on bumps and spontaneously shift up momentarily to the next larger cog because of a weak spring. This Shadow, by contrast has a nice firm spring that provides solid responsive shifting, even on the smallest cogs.

This derailleur is hands down one of the best I have ever used; It shifts quickly and accurately every time. It runs smooth and quiet and it supports the chain very nicely, I am using it on a recumbent so on my bike it has a lot of chain to manage and it does it with out any problem.I ride year round and I have noticed that in temperatures below 25 degrees it gets a bit sluggish but then so do the shifters. I guess you can't have every thing.I am verry happy with it and would buy it again with out hesitation.

I received the Shimano XT Derailleur today and the packaging was all beat up. The derailleur was not secured in its box and appeared to be a return. That notwithstanding there was no obvious damage to the XT. I installed it replacing a Sram X9 derailleur. The X9 was blocking the rear axle on my Volae recumbent where the XT allowed me to mount lugs for my Burley XC Trailer. I only had to use an little longer housing. I did not have to adjust the hi/low limiter screws at all.I would not recommend this conversion because the XT does not shift as well as the X9 and the shifter effort was much higher. This not a reflection on the XT derailleur moreover an issue with mixing Shimano with SRAM hardware.

I had to replace my rear derailleur for the first time on my Specialized Stumpjumper. It came with an XTR version of this (2-3 years old now) and the old one got clobbered in a fall (maybe two?). When I went into the store to get a new one I was in sticker shock over the $200 price tag for the XTR. I said no thanks and did some research. The differences between this model and the XTR are minuscule and not worth the extra money. After a few hours of work I had this working and it shifts just as beautifully as my old one. This will be my standard from now on.Be careful in your selection of the model you are looking for as there are differences for different bikes, different gears, etc. They make them all and you need to get the right model. This is particular one is probably the most common though. You should replace your shifter cable at the same time too. Instructions that came with this are pretty good, but could be a bit better.

Bought this as a replacement for a tired XT ( I believe ) on my 10 year old Specialized Epic. After installing and a cursory set-up at home, I bagged a couple of rides before putting the bike in professional hands for a full overhaul. Shifting was hugely improved over the previous derailleur even with my ham-handed tuning, and is flawless now. The lower profile from the geometry of this unit will be welcomed in keeping it out of the rocks and cactus here.Be advised - my experience is that derailleur adjustment is a bit of an art; mad props if you're able to dial it in to the level this thing will perform.

I was surprised to find that my XT rear derailleur was finally past it - it had taken one too many slams, has been neglected for far too long, the cage was mangled a bit. It was a lot to ask from a derailleur over 5 years with little to no care or attention. IT definitely lived a hard life. I had no hesitation about replacing it with another XT, and this is the shadow variant which is much slimmer to be less in the way of danger on a ride. I expect this to last just as long, if not longer.

I'm a novice rider with a Giant Iguana MTB that I bought in 2006. I've ridden the bike hard a few times on advanced, rocky trails but most of the riding I've done has been on intermediate and beginner trails. I didn't find the justification to throw money into the bike so I've ridden it as it was equipped from the manufacture, at least until now. I bought this RD-M772 SGS Rear Derailleur because my 7 year old Alivio Derailleur was skipping gears and could not be corrected with adjustment. I figured I'd spend money in better components rather than buying a new bike since my frame is still very good. I also got a new  SRAM PC 971 Chain - 9-Speed  in the same order.My only regret is that I didn't make the upgrade sooner! It took about 20 minutes of tinkering with the adjustments to get it just right, but once I was done, the shifting is amazingly smooth and quiet compared to the old Alivio. Highly recommended!My next upgrade will likely be a new  Shimano XT FC-M770/M760 Hollowtech II Crankset  but I need to figure out the right size to order.

Perfect for my 11-40 classic 1990 Giant Cadex 980C carbon fiber road bike project. Missed a star because I need to purchase a longer B screw and deraileur extender. Not Deore’s fault though.