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Shimano Deore M591 SGS Rear Derailleur

Item #: RD277A01
From USD$39.99 33% 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
 
4.8

(based on 8 reviews)

Ratings Distribution

  • 5 Stars

     

    (6)

  • 4 Stars

     

    (2)

  • 3 Stars

     

    (0)

  • 2 Stars

     

    (0)

  • 1 Stars

     

    (0)

100%

of respondents would recommend this to a friend.

Pros

  • Easy to install (6)
  • Precise shifting (5)
  • Durable (3)

Cons

    Best Uses

    • Mountain biking (8)
      • Reviewer Profile:
      • Avid cyclist (5)
      • Was this a gift?:
      • No (8)

    Reviewed by 8 customers

    Sort by

    Displaying reviews 1-8

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    (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
           
          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
             
            5.0

            Smooth shifting, affordable price

            By Florida trailrider

            from Florida

            About Me Avid Cyclist

            Pros

            • Crisp Shifting
            • Easy To Install
            • Low price

            Cons

              Best Uses

              • Casual Riding
              • Mountain Biking

              Comments about Shimano Deore M591 SGS Rear Derailleur:

              Easy to install and adjust, smooth quick shifting, nice upgrade from an acera.

              • Was this a gift?:
              • No
               
              4.0

              solid derailleur

              By heartland

              from Indiana

              About Me Avid Cyclist

              Verified Reviewer

              Pros

              • Durable
              • Easy To Install

              Cons

                Best Uses

                • Casual Riding
                • Mountain Biking

                Comments about Shimano Deore M591 SGS Rear Derailleur:

                Deore is a great value. I ran a Deore rear derailleur for years and it was a great part. The shifting is a little sluggish compared to higher end derailleurs, and it's a bit heavier, but it's also 1/2 the price, so you can't complain too much. Easy to install and adjust-- great bang for the buck here.

                • Was this a gift?:
                • No
                 
                5.0

                Great Deraillure!

                By Pulley

                from Tempe, AZ

                About Me Avid Cyclist

                Verified Reviewer

                Pros

                • Adjustable
                • Easy To Install

                Cons

                • NONE

                Best Uses

                • Mountain Biking

                Comments about Shimano Deore M591 SGS Rear Derailleur:

                This Derailleur came stock on my Marin. It worked great, and is very easy to adjust with the barrel adjuster on the derailleur.

                • Was this a gift?:
                • No

                Displaying reviews 1-8

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