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  • Shimano Deore M591 9 Speed Rear Mech
  • Shimano Deore M591 9 Speed Rear Mech
NOW$38.49
  • RRP$68.49
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Long Cage
  • IN STOCK(5+)

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Shimano Deore Rear Derailleur 9sp M591

High-performance components for serious cycling fun. Deore is designed to appeal to a wide range of cycling fans.

Shimano Deore Rear Derailleur 9sp M591 Features:

  • Precise chain movement
  • Changes gears smoothly
  • Light shift effort
  • Using Shimano's classic Double Servo-Panta mechanism
  • Versatile design (on/off road)
  • Compatible with 28-34T low sprocket
  • Colour options: Black or Silver

Buy Shimano Deore Rear Derailleur 9sp M591 from Chain Reaction Cycles, the worlds largest online bicycle store.

  • Colour: Silver, Black
  • Size: Long Cage
  • Speed: 9 Speed
Rated 4 out of 5 by 10 reviewers.
Rated 1 out of 5 by туфта Стоял такой на купленном Kross Hexagon X9 отстойный переключатель. 2 месяца откатал и начались проблемы. 2-3 раза надо щелкнуть монеткой чтобы что-то произошло. вроде настроишь. 2-3 дня и опять тоже самое. Поставил старый Шимано оливио и забыл про него как о страшном сне. 16 May 2014
Rated 5 out of 5 by Надежный, долговечный переключатель Отъездил более 11 тыс. км. - никаких нареканий, разве что ролики поизносились. 19 August 2013
Rated 4 out of 5 by Deore m591 rear mech. I own 3 of these,and they have lasted years. A clean and a lube when required and cable adjustment and replacement from time to time. As others have commented ....not the lightest or the best ,but they just go on working. Wish the medium cage model was still available . 18 April 2013
Rated 5 out of 5 by Why spend more? Brilliant piece of kit, at an amazing price. Three times the money won't get you anything appreciably better; lighter, maybe, by a few micrograms, but weight benefits are wildly over-rated unless you're a pro racer. And if you're reading this, you're no pro racer! I use this with a 12-36 tooth cassette. The manual says the Deore is only rated to shift to 34t, but it manages the 36t effortlessly (adjust the B tension screw until you have the setting you want). Looks nice too: like a classic derailleur, instead of a Transformer toy. 03 January 2013
Rated 5 out of 5 by brilliant smooth shift Replaced my xt derailleur with this one, and my bike came alive again, for the price you just cant beat it,very smooth changes a great bit of kit. 19 June 2011
Rated 2 out of 5 by Really not that great. Now, i'm a serious rider; i go every week without fail. I had this on my kona stinky 2008 for 3 months and it's gone. I understand that this isn't the best derailleur in the world and probably isn't designed for dh & fr but this has always had issues. When i took my gears to a well respected local bike shop to be done well, it lasted about 10 mins before it was unalligned again. I had done nothing serious either. Now last week, went freeriding and DHing and it snapped off from doing a two ft drop on the run in for a bigger drop. Overall verdict = BAD! If you are a free rider or Down Hiller then PLEASE DO NOT BUY THIS! Spend a bit more and get the SLX! I have..... Now. Oh and did i mention that the spring in this is so weak that it moves around so much that it will either damage your frame or the Derailleur it's self. And thats just while riding down a curb! 29 March 2011
Rated 5 out of 5 by is cheap i s quite cheaper (good for budget) in class that u can use this item for competition ride.i can assume this is in middle class..cheaper and reliable. 24 February 2011
Rated 3 out of 5 by Deore - a problem child? I have this derailleur on a mid-priced Trek MTB, and I have always had slipping gears on the middle crank especially. Slow and imprecise gear changes and slips have seen me come unstuck on climbs and almost certainly contributed to me breaking chains. I can't be 100% certain that the derailleur is the problem, but I have worked my way through replacing everything else with no effect. I'm about to replace with a more expensive SRAM system, which my usual riding partners use without problems. 07 November 2010
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4 Questions : 6 Answers

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Gender: Male
10 months ago
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Rossendale,GB
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Answer: 
This is not a 'Rapid Rise' mech therefore will rest at the bottom when not under tension.

Bottom-normal.
10 months ago
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Answer: 
The M591 is a standard mech, so "Top Normal" as in chain on the smallest cog on your rear cassette with no tension on the shifter cable.

I believe that the M580 is the "Low Normal / Rapid Rise" chain on the largest cog with no tension on the shifter cable, if that is what you are looking for.
Age: 45 to 54
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3 months, 1 week ago
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Age: 45 to 54
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Attitude: Just for Fun
3 months, 1 week ago
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Canberra,AU
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Answer: 
Yes, the M591 will work fine as a replacement for the M581. Just one is Deore spec and the other the slightly more expensive LX spec. Other than that they're both a standard 9 speed RD.
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Answer: 
You can certainly replace the Deore LX with a Deore.
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3 months, 1 week ago
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Bought a new Long Cage derailleur from CRC last week. Fitted and shifts, but clicks on jockeys.
Have tried adjusting B Tension Bolt. Could it be a new chain which needs to be longer?
Age: 45 to 54
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3 months, 2 weeks ago
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HOLYWELL,GB
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Answer: 
So long as you have an adequate gap between the top jockey wheel and the cassette when in the largest cog then it's not a B-tension issue. You need to look at the extension on the rear mech when in the combination across the largest cog at the rear and the largest chain ring. Is the mech over stretched? If so then you may need a longer chain. Don't forget to allow for chain growth if on a full suspension bike as the chain length may need to be longer when the rear suspension is compressed.
Also, check the routing of the chain through the rear mech. A really easy mistake is to route the chain the wrong side of the little metal flap on the cage between the two jockey wheels. This will also give you a constant clicking noise as the chain will rub on the flap.
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Would this be a suitable replacement for a Shimano Deore LX rear mech?
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2 months, 2 weeks ago
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Manchester,GB
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Answer: 
Yes. Deore is just a few grams heavier than LX.
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