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Shimano Deore M591 SGS Rear Derailleur

USD$32.99 45% off USD$59.99 msrp
Item #: RD277A01
USD$32.99 45% off USD$59.99 msrp
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The Deore series is a staple of the Shimano lineup, offering outstanding performance at an affordable price.
  • Proven technologies deliver durability and reliability
  • Versatile design, on or off road
  • Double Servo-Panta mechanism for smooth consistent shifts
  • Light weight, approximate weight 299 grams
  • Optimized for use with Shimano 9 speed, will also work with Shimano 8 speed



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REVIEW SNAPSHOT®

by PowerReviews
Shimano Deore M591 SGS Rear Derailleur
 
4.7

(based on 13 reviews)

Ratings Distribution

  • 5 Stars

     

    (9)

  • 4 Stars

     

    (4)

  • 3 Stars

     

    (0)

  • 2 Stars

     

    (0)

  • 1 Stars

     

    (0)

100%

of respondents would recommend this to a friend.

Pros

  • Easy to install (11)
  • Precise shifting (9)
  • Durable (4)

Cons

No Cons

Best Uses

  • Mountain biking (11)
  • Road biking (5)
    • Reviewer Profile:
    • Avid cyclist (10)
    • Was this a gift?:
    • No (13)

Reviewed by 13 customers

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Displaying reviews 1-10

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4.0

Just like stock

By Eden

from Killington, VT

About Me Avid Cyclist

Verified Buyer

Pros

  • Durable
  • Easy To Install

Cons

    Best Uses

    • Mountain Biking

    Comments about Shimano Deore M591 SGS Rear Derailleur:

    This replaced my stock derailleur and it is identical. The shipping was great. I was able to get by bike back and running in 2 days!

    • Was this a gift?:
    • No
     
    4.0

    Great value for a Shimano product

    By Spoke Buster

    from San Jose, CA

    About Me Avid Cyclist

    Verified Buyer

    Pros

    • Easy To Install
    • Precise Shifting

    Cons

      Best Uses

      • Mtn Cassette On Road Bike
      • Road Biking

      Comments about Shimano Deore M591 SGS Rear Derailleur:

      I use 11-32 mountain cassette on my road bike and this derailleur works great to get into that 32 gear.

      • Was this a gift?:
      • No
       
      5.0

      Excellent Deraileur Great Price

      By Big D

      from Southern Oregon

      About Me Avid Cyclist

      Verified Buyer

      Pros

      • Easy To Install
      • Precise Shifting

      Cons

      • Heavy

      Best Uses

      • Road Biking

      Comments about Shimano Deore M591 SGS Rear Derailleur:

      I was hesitant to buy usually prefer XT or Better. But this outperforms my 10yr old XT derailleur by far. Fast Precise shifting. For the money you cannot beat it!!!

      • Was this a gift?:
      • No
       
      5.0

      Works with STI shifters on a road bike!

      By Old Guy

      from Northern Arizona

      About Me Avid Cyclist

      Verified Reviewer

      Pros

      • Easy To Adjust
      • Easy To Install
      • Precise Shifting
      • Precise Shifting Across

      Cons

      • None Found Yet

      Best Uses

      • Mountain Biking
      • Road Biking

      Comments about Shimano Deore M591 SGS Rear Derailleur:

      Although Deore is a MTB derailleur, I decided to give it a try on my road bike. I was in need of a nine speed derailleur with 32 tooth cog capacity and it has become difficult to find that combination in a road bike derailleur now, with every thing being ten or eleven speed. This derailleur works perfectly with STI shifters, with precise cog alignment with each shift and the shifts are very smooth. I am well pleased with the product and pleasantly surprised that it works with STI.

      • Was this a gift?:
      • No

      (1 of 1 customers found this review helpful)

       
      5.0

      Perfect for Road Triple Conversion

      By Powegian

      from Poway, CA

      About Me Avid Cyclist

      Verified Buyer

      Pros

      • Easy To Install
      • Precise Shifting

      Cons

        Best Uses

        • Mountain Biking
        • Road Biking

        Comments about Shimano Deore M591 SGS Rear Derailleur:

        I bought this to upgrade my classic road frame to a super wide range of gears for high mountain road riding at a reasonable price. This is a long arm "mountain" derailleur labeled "9-speed", but it works perfectly with 105 triple 10 speed shifters. It shifts as well as my (now unavailable) Dura-Ace triple rear derailleur at 1/4 the price. N. B. Shimano "10 speed shadow" derailleurs do not work easily with road shifters, so I was glad to find this.

        • Was this a gift?:
        • No

        (1 of 1 customers found this review helpful)

         
        5.0

        Excellent Choice

        By Durango52

        from Binghamton, NY

        About Me Casual/ Recreational

        Verified Buyer

        Pros

        • Precise Shifting

        Cons

          Best Uses

          • Mountain Biking
          • Road Biking

          Comments about Shimano Deore M591 SGS Rear Derailleur:

          I replaced a 14 year old Shimano Deore XT rear derailleur on my Performance mountain bike with this Shimano Deore M591 SGS. My LBS installed new cables, housing, and the derailleur and the bike now shifts like new, perhaps even better than new.

          Since the LBS did the work, I can not comment on the ease of installation.

          • Was this a gift?:
          • No
           
          5.0

          Silent ninja derailleur, simply perfect

          By St. Luke

          from Walnut Creek, CA

          About Me Avid Cyclist

          Pros

          • Enhances Pedaling Efficiency
          • Precise Shifting

          Cons

            Best Uses

            • Mountain Biking

            Comments about Shimano Deore M591 SGS Rear Derailleur:

            Let me preface by saying I also ride a road bike with SRAM Rival derailleurs. This Deore, coupled with Deore shifters are the best I've ridden in terms of smoothness and ease of shift. It's like just a small touch and you're there; effortless. Like butter. I can't even imagine what XTR is like. I put it on my commuter hybrid which is much overkill, but the shifts are phenomenal. I am a fan.

            • Was this a gift?:
            • No
             
            5.0

            Works great

            By Ratheon

            from Charlotte, NC

            About Me Casual/ Recreational

            Pros

            • Durable
            • Easy To Install
            • Precise Shifting

            Cons

              Best Uses

              • Mountain Biking

              Comments about Shimano Deore M591 SGS Rear Derailleur:

              Replaced a beat up Acera, worked great on my 8-speed!

              • Was this a gift?:
              • No
               
              4.0

              Good functional and reliable Derailleur!

              By Juan the Commuter

              from Tulsa, OK

              About Me Commuter

              Verified Buyer

              Pros

              • Durable
              • Easy To Install
              • Looks good
              • Precise Shifting

              Cons

              • Heavy

              Best Uses

              • Commuting
              • Mountain Biking

              Comments about Shimano Deore M591 SGS Rear Derailleur:

              Good functional and reliable rear derailleur that simply gets the job done right. I swapped my Shimano Acera with this one and even though my Acera did a good job on shifting, I did notice that this derailleur is more consistent and precise than the Acera (I do not have to readjust as often and the shifting is more crisp). I really do not think it weighs more or less than my older unit but then again I do not take the time to weigh every single component that goes on my bike. I cannot speak for actual mountain biking, but for commuting this unit is all you'll ever need if you have a Mountain bike converted into a Commuter bike.

              Love the tough look and the chain seems to slap less when I installed this unit.

              • Was this a gift?:
              • No

              (1 of 1 customers found this review helpful)

               
              5.0

              works like it should

              By JB

              from HB

              About Me Avid Cyclist

              Verified Buyer

              Pros

              • Easy To Install
              • Precise Shifting

              Cons

                Best Uses

                • Mountain Biking

                Comments about Shimano Deore M591 SGS Rear Derailleur:

                I have Shimano Deore as my drivetrain and it works great! Funny how when you have ALL the same level of components making up your drivetrain things suddenly work as per design! I previously had 2 different rear derailers and always had some sort of problem or had to make constant adjustments. I almost expected the same with this one, but nope. It shifts up and down as desired.

                • Was this a gift?:
                • No

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                Get free shipping with your $50 purchase today when you choose Standard Shipping at checkout. Please note this offer is only available to physical shipping addresses in the 48 continental United States (no PO Boxes), and oversize charges still apply on some heavy/large items

                 

                Free Shipping Offer

                Get free Standard Shipping with your $50 purchase today! Just choose Standard Shipping during checkout.

                Please note this offer is only available to physical shipping addresses in the 48 continental United States (no PO Boxes), and oversize charges still apply on some heavy/large items.