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Shimano SLX M663 Rear Derailleur

Item #: RD242A02
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Shimano SLX M663 Rear Derailleur

10 Speed MTB! Shimano SLX Dyna-Sys takes legendary Shimano shifting to the next level of perfection. The shadow design lessens the chances of snagging a branch or clipping a rock while the direct cable routing lowers shifting effort. The wide pivots keep shifting smooth and consistent mile after mile.
  • 10 speed MTB Dyna-Sys
  • Lightweight design
  • Direct cable routing for effortless shifting
  • Wide pivots for consistent shifting
  • Shadow design
  • Long cage
  • Optimized for use with Dyna-Sys components only
  • This derailleur is not backwards compatible, it will only work with 10 speed Dyna-Sys shifters
  • Weight: 273g
Please Note: This is marked an OE Item because it lacks original packaging. The item has never been installed or used.

REVIEW SNAPSHOT®

by PowerReviews
Shimano SLX M663 Rear Derailleur
 
4.5

(based on 13 reviews)

Ratings Distribution

  • 5 Stars

     

    (7)

  • 4 Stars

     

    (6)

  • 3 Stars

     

    (0)

  • 2 Stars

     

    (0)

  • 1 Stars

     

    (0)

100%

of respondents would recommend this to a friend.

Pros

  • Durable (10)
  • Easy to install (10)
  • Attractive (8)
  • Lightweight (3)

Cons

No Cons

Best Uses

  • Mountain biking (13)
    • Reviewer Profile:
    • Avid cyclist (6), Casual/ recreational (5)
    • Was this a gift?:
    • No (12)

Reviewed by 13 customers

Displaying reviews 1-10

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(1 of 1 customers found this review helpful)

 
4.0

smooth ... like it

By tj

from Atlanta, GA

About Me Avid Cyclist

Verified Buyer

Pros

  • Easy To Install
  • Shadow Design

Cons

    Best Uses

    • Mountain Biking

    Comments about Shimano SLX M663 Rear Derailleur:

    Got this after old oem derailleur exploded on the trail. Looked at way too many reviews, and choose this because only $10 more on sale than a deore. Very happy with product, however would advise on putting $$$ into shifter first. This piece is too close to the action, and it is the shifter that really determines shift quality. For a few bucks more it is a no brainer to choose this derailleur.

    Very impressed with quality, and strength of components. Should take more than a twig to take this one out. Has been a great compliment to my XT shifter. Smooth, instant shifting that has greatly improved ride satisfaction over oem components. Definitely beefier than the deore. Also the shadow design does get it out of the action in higher gears. Worth the upgrade.

    And unless you are at 5% body fat don't tell me about ounces while your fat butt engulfs a seat ... Sorry don't get this non-pro weight obsession.

    • Was this a gift?:
    • No
     
    5.0

    Superb value

    By CycloChassid

    from Israel

    About Me Avid Cyclist

    Verified Buyer

    Pros

    • Easy To Install

    Cons

      Best Uses

      • Mountain Biking

      Comments about Shimano SLX M663 Rear Derailleur:

      This completed my upgrade from 3x9 to 3x10.

      • Was this a gift?:
      • No
       
      4.0

      Great value

      By THEB

      from Buenos Aires, Argentina

      About Me Casual/ Recreational

      Verified Buyer

      Pros

      • Attractive Design
      • Durable
      • Easy To Install

      Cons

      • Heavy

      Best Uses

      • Mountain Biking

      Comments about Shimano SLX M663 Rear Derailleur:

      Great 10 speed rear derailleur. It´s a litle heavier than XT or XTR, but much cheaper.
      It does the job great.
      I wonder why shimano offers the same jockey wheels for all (inclusive high-end) derailleurs. I change those for a ceramic bearing Jockey wheels.

      • Was this a gift?:
      • No
       
      5.0

      Low bling - Great RD

      By nt5k

      from Minneapolis, MN

      About Me Competitive Cyclist

      Verified Buyer

      Pros

      • CHEAP
      • Works Perfect

      Cons

      • NONE

      Best Uses

      • Mountain Biking
      • Racing

      Comments about Shimano SLX M663 Rear Derailleur:

      Needed a cheap fast replacement for a busted xtr RD. Nailed it.

      • Was this a gift?:
      • No
       
      5.0

      easy to setup and durable

      By alberto95

      from Ponce, PR

      About Me Casual/ Recreational

      Verified Reviewer

      Pros

      • Attractive Design
      • Durable
      • Lightweight

      Cons

        Best Uses

        • Mountain Biking

        Comments about Shimano SLX M663 Rear Derailleur:

        this thing is easy to setup, no need to tamper all around to make it work, and has the shimano seal for durability and dependability.

        • Was this a gift?:
        • No

        (0 of 1 customers found this review helpful)

         
        4.0

        Good upgrade for older hardtail

        By WiAlan

        from Wisconsin

        About Me Competitive Cyclist

        Verified Reviewer

        Pros

        • Durable
        • Easy To Install

        Cons

          Best Uses

          • Mountain Biking

          Comments about Shimano SLX M663 Rear Derailleur:

          Converting an older Specialized hardtail to 1x10 as an XC race bike. SLX rear der. worked great for this and I am happy with the performance after a summer's riding.

          • Was this a gift?:
          • No
           
          4.0

          No Problems

          By mtbjunkie

          from Buena Vista, CO

          About Me Avid Cyclist

          Pros

          • Attractive Design
          • Durable
          • Easy To Install

          Cons

            Best Uses

            • Mountain Biking

            Comments about Shimano SLX M663 Rear Derailleur:

            No problems so far. This is my first go-round with a 10sp drivetrain and I'm loving the SLX group. I wish it had the clutch, but other than that, no complaints.

             
            5.0

            Can't get any better

            By Van H

            from Puerto Rico island

            About Me Avid Cyclist

            Verified Reviewer

            Pros

            • Attractive Design
            • Durable
            • Easy To Install

            Cons

              Best Uses

              • Mountain Biking

              Comments about Shimano SLX M663 Rear Derailleur:

              Even when shimano recommends dyna-sys cassette and chain I'm using sram. Works perfect.

              • Was this a gift?:
              • No
               
              4.0

              I was quite pleased with the performance

              By yobilly

              from Riverside, CA.

              About Me Casual/ Recreational

              Verified Buyer

              Pros

              • Attractive Design
              • Durable
              • Easy To Install
              • Lightweight

              Cons

                Best Uses

                • Mountain Biking

                Comments about Shimano SLX M663 Rear Derailleur:

                I was quite pleased with the performance of this derailleur. Once dialed in it works flawlessly

                • Was this a gift?:
                • No
                 
                5.0

                Great Derailleur

                By Masterofbikes

                from Boulder, CO

                About Me Casual/ Recreational

                Verified Buyer

                Pros

                • Attractive Design
                • Durable
                • Easy To Install

                Cons

                  Best Uses

                  • Mountain Biking

                  Comments about Shimano SLX M663 Rear Derailleur:

                  Buy an OE products and save money. Derailleur was new just without the original packaging.

                  • Was this a gift?:
                  • No

                  Displaying reviews 1-10

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                  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.