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Shimano SLX RD-M663 Rear Derailleur

Item #: RD272A00
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10 Speed MTB!  Shimano SLX Dyna-Sys takes legendary Shimano shifting to the next level of perfection.  The shadow design lessens the changes of snagging a branch or clipping a rock while the direct cable routing lowers shifting effort.  The wide pivots keep shifting smooth and consistent for 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
  • This derailleur is not backwards compatible, it will only work with 10 speed shifters
  • Shimano shifters



REVIEW SNAPSHOT®

by PowerReviews
Shimano SLX RD-M663 Rear Derailleur
 
4.2

(based on 13 reviews)

Ratings Distribution

  • 5 Stars

     

    (6)

  • 4 Stars

     

    (6)

  • 3 Stars

     

    (0)

  • 2 Stars

     

    (0)

  • 1 Stars

     

    (1)

92%

of respondents would recommend this to a friend.

Most Liked Positive Review

 

Tough little guy

So I bought the slx to replace my rather unsatisfactory derailleur (hint, not shimano) and noticed immediately that it was going to work better just based on the shadow technology since I knew it...Read complete review

So I bought the slx to replace my rather unsatisfactory derailleur (hint, not shimano) and noticed immediately that it was going to work better just based on the shadow technology since I knew it wouldn't be sticking out and hitting rocks (something i actually do quite a bit). Once it was installed though I knew it was going to pay for itself very soon, the shifting was awesome and because there wasn't a ton of adjustment knobs I didn't have to worry about it getting out of whack much. My favorite feature was, like I anticipated, the toughness and shadow technology. This thing can take a beating, i've crashed the bike, dropped it multiple times on the drive side and accidentally kicked it but it still worked wondrously. The shadow technology helped protect it from a thousand other hits though, and that alone helped preserve the thing. My one and only complaint? I can no longer enjoy the product since my bike was stolen last year (saddest day ever). I highly recommend this as well as all other Shimano products, they always keep getting better and last forever.

VS

Most Liked Negative Review

 

Worked great while it lasted

This was great for xc riding and lasted maybe 50 miles total before being ripped off by a twig/stick a little larger than a pen. To me it seems far too fragile. Had ...Read complete review

This was great for xc riding and lasted maybe 50 miles total before being ripped off by a twig/stick a little larger than a pen. To me it seems far too fragile. Had a Shimano LX from 2005 that lasted until April 2012. The SLX only lasted one month. For a budget derailluer I would go with the LX over SLX.

Reviewed by 13 customers

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Displaying reviews 1-10

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4.0

80% XT For 50% price

By Trail-Runner

from San Antonio, Tx

About Me Avid Cyclist

Verified Buyer

Pros

  • Always Perfect Shifting
  • Decent Strength
  • Durable
  • Lightweight
  • Not Too Heavy

Cons

  • No Bearings
  • Plastic Bushings

Best Uses

    Comments about Shimano SLX RD-M663 Rear Derailleur:

    Awesome!

    Only con: Plastic Bushings = No Bearings like XT has on spinner.

    • Was this a gift?:
    • No
     
    4.0

    Solid derailleur

    By Brendan

    from Colorado

    About Me Avid Cyclist

    Verified Buyer

    Pros

    • Easy To Install
    • Precise Shifting

    Cons

      Best Uses

      • Mountain Biking

      Comments about Shimano SLX RD-M663 Rear Derailleur:

      This is much higher quality than the Deore of old days. Seems like quality derailleur for low price.

      • Was this a gift?:
      • No
       
      5.0

      Really good

      By banda

      from Reedley ca

      Verified Reviewer

      Pros

      • Quick When Dialed In
      • Sharp shifting

      Cons

        Best Uses

        • Mountain

        Comments about Shimano SLX RD-M663 Rear Derailleur:

        Having only had the cheaper stuff on past bikes the difference between this derailleur and the stock acera stuff is pretty amazing. Ive never had the XT stuff so I cant compare the two but if your thinking about this one buy it its a good one.

         
        5.0

        Perfect for trail bikes

        By Justin

        from Southwest Virginia

        Verified Reviewer

        Pros

        • Clean Shifts

        Cons

          Best Uses

          • Am
          • Trail

          Comments about Shimano SLX RD-M663 Rear Derailleur:

          Never had a problem with a Shimano derailleur. Had the 9 speed version of this derailleur on my old bike and put the 10 speed version on my new 1x10 29er. Works like a charm.

           
          4.0

          great for the price

          By Tbraun

          from Saskatoon, sk

          Verified Reviewer

          Pros

          • Cost
          • durability
          • Shifts great

          Cons

          • none at this time

          Best Uses

            Comments about Shimano SLX RD-M663 Rear Derailleur:

            I have owned this for about half a year and I havent needed to do a lot of adjusting on it since I got it. for the price I cant find a lot to complain about, I would recomend it to any one.

             
            4.0

            Shimano SLX RD-M663 RD

            By Revelstoked

            from Oakville, Ontario

            Verified Reviewer

            Pros

            • Dependable
            • Easy Install
            • Easy setup
            • Price Point
            • Silent
            • Smooth

            Cons

            • none

            Best Uses

            • XC

            Comments about Shimano SLX RD-M663 Rear Derailleur:

            The SLX line continues to impress time after time. Great balance of value, performance & dependability.

             
            4.0

            Great value

            By Moose

            from Ontario, Canada

            Verified Reviewer

            Pros

            • cheap
            • Good performance
            • Reliable

            Cons

            • Chainslap

            Best Uses

            • Mountain Bike

            Comments about Shimano SLX RD-M663 Rear Derailleur:

            I have this on my do it all trailbike, and it has been great to me. Good value, and good shifting performance. For the price you pay you get a great derailleur.

             
            5.0

            love this derailleur

            By heartland

            from Indiana

            Verified Reviewer

            Pros

            • Low Chain Slap
            • Smooth shifting
            • value

            Cons

              Best Uses

              • Cross
              • Mountain

              Comments about Shimano SLX RD-M663 Rear Derailleur:

              I have this derailleur mounted on my Surly Cross Check (I wanted to have a 11-34 cassette for off road and touring). It's great - I've hardly had to adjust it over the last two years of hard riding, and the shadow design really does a good job of reducing chain slap. Pairs well with Tiagra brifters, too.

               
              5.0

              Tough little guy

              By Jonny

              from Chico, CA

              Verified Reviewer

              Pros

              • Did I Mention Tough
              • Easy to clean
              • Fast
              • Smooth
              • Strong
              • Super easy to adjust

              Cons

              • Took some time to set up

              Best Uses

              • Am
              • Inexpensive Xc
              • Light DH

              Comments about Shimano SLX RD-M663 Rear Derailleur:

              So I bought the slx to replace my rather unsatisfactory derailleur (hint, not shimano) and noticed immediately that it was going to work better just based on the shadow technology since I knew it wouldn't be sticking out and hitting rocks (something i actually do quite a bit). Once it was installed though I knew it was going to pay for itself very soon, the shifting was awesome and because there wasn't a ton of adjustment knobs I didn't have to worry about it getting out of whack much. My favorite feature was, like I anticipated, the toughness and shadow technology. This thing can take a beating, i've crashed the bike, dropped it multiple times on the drive side and accidentally kicked it but it still worked wondrously. The shadow technology helped protect it from a thousand other hits though, and that alone helped preserve the thing. My one and only complaint? I can no longer enjoy the product since my bike was stolen last year (saddest day ever). I highly recommend this as well as all other Shimano products, they always keep getting better and last forever.

               
              5.0

              SLX

              By Chowda

              from Douglas, MA

              Verified Buyer

              Pros

              • cheap
              • Performance

              Cons

              • none

              Best Uses

              • Trail

              Comments about Shimano SLX RD-M663 Rear Derailleur:

              Tough to beat at this price point. Works great, quiet and efficient.

              Displaying reviews 1-10

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