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Shimano M640 Zee Rear Derailleur

Item #: RD245C00
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USD$67.99 24% off USD$89.99 msrp
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Zee is Shimano’s new line of Gravity-specific components, for those of us who do not have multi-million dollar sponsors. The 10 speed Zee RD-M640 features Shimano's premier Shadow Plus technology, which introduces a switchable friction clutch into the rear linkage that significantly reduces chain noise and offers a more stable drivetrain through rough terrain. With a flick of an anodized gold switch, it also virtually eliminates chain slap, makes changing out rear wheels easier, and reduces the possibility of dropping your chain.

Zee is tuned specifically for 1x10 applications, although narrow range 2x10 applications will also work with this derailleur so long as extreme gear combinations are not used. The Zee derailleur is offered in two short cage (SS) configurations: DH and FR. The DH derailleur has a specific actuation arc that will closely follow closely spaced DH ratio cassettes, up to 11-28T. The FR version is designed for riders who hit more varied terrain, and want to go uphill as well as downhill, featuring capacity up to 11-36T cassettes.

Feature-packed, and surprisingly light, the Zee rear derailleur is designed specifically for hard gravity riders on a budget, because everyone, not just the pros, should be able to crush every line.

  • Shadow Plus Chain Stabilization Technology
  • Short Cage (SS cage)
  • Compatible with 10-speed Shimano Dyna-Sys shifters only.
  • Shadow RD technology: Super low-profile design with built in chain stabilizer
  • DH Spec - 28T Max Cog Capacity
  • FR Spec - 36T Max Cog Capacity
  • Chain Wrap Capacity: 25T (both DH and FR spec)
  • Actual Weight: 268g
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REVIEW SNAPSHOT®

by PowerReviews
Shimano M640 Zee Rear Derailleur
 
4.4

(based on 19 reviews)

Ratings Distribution

  • 5 Stars

     

    (8)

  • 4 Stars

     

    (11)

  • 3 Stars

     

    (0)

  • 2 Stars

     

    (0)

  • 1 Stars

     

    (0)

100%

of respondents would recommend this to a friend.

Pros

  • Attractive (16)
  • Durable (15)
  • Easy to install (13)
  • Lightweight (9)

Cons

    Best Uses

    • Mountain biking (18)
    • Upgrade (6)
      • Reviewer Profile:
      • Avid cyclist (13)
      • Was this a gift?:
      • No (17)

    Reviewed by 19 customers

    Sort by

    Displaying reviews 1-10

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    5.0

    Great short cage option

    By Bric

    from Ontario Canada

    About Me Avid Cyclist

    Verified Reviewer

    Pros

    • Attractive Design
    • Durable
    • Easy To Install
    • Lightweight

    Cons

      Best Uses

      • Mountain Biking

      Comments about Shimano M640 Zee Rear Derailleur:

      I use this on my 1x10 with a narrow wide chainring and never miss a shift or drop a chain. SLX quality in a short cage offering.

       
      4.0

      Excellent Derailleur

      By HCS01

      from San Diego, CA

      About Me Commuter

      Verified Reviewer

      Pros

      • Attractive Design
      • Durable
      • Lightweight

      Cons

        Best Uses

        • Mountain Biking
        • Upgrade

        Comments about Shimano M640 Zee Rear Derailleur:

        This is a durable, rigid, clean shifting piece. The short cage keeps it out of the way, and the clutch keeps everything nice and tight.

        I use it on a 1x10 with a RaceFace narrow wide and have no issues at all. I just wish Shimano sold a short cage XT.

        • Was this a gift?:
        • No
         
        4.0

        Excellent Derailleur

        By HCS01

        from San Diego, CA

        About Me Commuter

        Pros

        • Attractive Design
        • Durable
        • Easy To Install

        Cons

          Best Uses

          • Mountain Biking
          • Upgrade

          Comments about Shimano M640 Zee Rear Derailleur:

          Durable, well built piece.
          Short cage keeps it out of the way.
          Clutch keeps everything tight.

          This is basically a short cage SLX and will not dissapoint. Well worth it on a trail bike.

          I do wish Shimano sold a short cage XT, though.

          • Was this a gift?:
          • No
           
          5.0

          Very happy with the outcome

          By Matt

          from Raleigh, NC

          About Me Avid Cyclist

          Verified Reviewer

          Pros

          • Attractive Design
          • Durable
          • Easy To Install
          • Quiet

          Cons

            Best Uses

            • Mountain Biking

            Comments about Shimano M640 Zee Rear Derailleur:

            I purchased this product over the OE slx rear derailleur which i was also looking at for an all mountain hardtail project and I couldnt be any happier with the end result. Once set up, it shifts very nicely and the clutch mechanism eliminates chain slap and keeps my chain from dropping on my 1X10 set up. I would definitely recommend this to anyone whos on the fence about it.

            • Was this a gift?:
            • No
             
            4.0

            great for 1x

            By jcd

            from mississippi

            About Me Avid Cyclist

            Verified Reviewer

            Pros

            • Attractive Design
            • Durable
            • Easy To Install

            Cons

            • Heavy

            Best Uses

            • Mountain Biking
            • Racing

            Comments about Shimano M640 Zee Rear Derailleur:

            shifts well. just a short cage SLX so expect that level of quality. good for the money

            • Was this a gift?:
            • No
             
            4.0

            Great!

            By D Hedden

            from Coeur d'Alene Id

            About Me Avid Cyclist

            Verified Reviewer

            Pros

            • Attractive Design
            • Durable
            • Easy To Install
            • Lightweight

            Cons

              Best Uses

              • Mountain Biking

              Comments about Shimano M640 Zee Rear Derailleur:

              This is a great derailleur. It shifts cleanly and is super quiet going down hill. Highly recomend.

              • Was this a gift?:
              • No
               
              4.0

              Great Looking but Miss-Shifting

              By ChadB

              from Baltimore, MD

              About Me Avid Cyclist

              Verified Reviewer

              Pros

              • Attractive Design
              • Durable

              Cons

                Best Uses

                • Mountain Biking

                Comments about Shimano M640 Zee Rear Derailleur:

                I was very excited about purchasing the Zee deraileuer after reading so many positive reviews online. I was converting my 2014 GT Karakoram Elite over to a 1 x 10 drive train. I selected a Shimano XT shifter, Race Face Chester Cranks and BB with 32T narrow wide chain ring and light bashguard. In the rear I selected the ZEE deraileuer (the one that handles up to a 36T), XT 11-36 Cassette and XT 10 Speed Chain. Everything looked awesome and definitely dropped significant weight from the bike. I was on a 15 mile ride for the first time on a flat rail trail. Everything was shifting smoothly until about the last mile where my chain completely missed the smallest cog. The chain wound up jammed between the smallest cog and my frame, doing some damage to the frame. I took it to my LBS that did the installation and they adjusted the deraileuer and cable tension and sent me on my merry way. I then rode another 12 miles and experienced the same miss-shift going from the 9 to 10th gear. Back to the LBS. They adjusted it again. I then put about 1.5 hrs in on some pretty rocky trails and was happy to report no chain drops or miss-shifting. I thought the problem was fixed until I did the same 15 mile ride with the same miss-shifting problem once again on the last mile. Back to the LBS and they were able to recreate the problem as well. Trying to come up with a solution for the problem they began swapping components such as the shifter, cassette, wheels and deraileuer. Changing out a ZEE deraileuer for an SLX seemed to correct the miss-shifting issue. I wound up removing the ZEE deraileuer in favor for an XT Shadow Plus Medium cage and have not had any miss-shifts or chain drops. I don't know if it just happened to be my set-up or just bad luck but I am bummed not to be able to use the ZEE. It's a great looking design and seems bulletproof, it just wasn't working for me. I would recommend it however after reading such great reviews online.

                • Was this a gift?:
                • No
                 
                4.0

                Quiet and smooth

                By Ricky

                from Mesa, AZ

                About Me Avid Cyclist

                Verified Buyer

                Pros

                • Attractive Design
                • Durable
                • Easy To Install

                Cons

                • Heavy

                Best Uses

                • Mountain Biking
                • Upgrade

                Comments about Shimano M640 Zee Rear Derailleur:

                I did some research about pairing this with a 9 speed drivetrain and it works. I have an XO 9 spd shifter, XT 9 spd cassette, and XT 9 spd chain. I had to use a 6mm spacer on the rear mech for precise shifting. It beats having to upgrade everything. Now my drivetrain is quiet with barely any chain slap. I'm also running it as a 1x9 with the RaceFace Narrow Wide 30t chainring. 4 out of 5 stars due to the weight, it's heavy, but it's burley.

                • Was this a gift?:
                • No
                 
                5.0

                Top stuff

                By Gabe

                from Santiago, Chile

                About Me Casual/ Recreational

                Verified Reviewer

                Pros

                • Attractive Design
                • Durable
                • Easy To Install
                • Lightweight

                Cons

                • NONE

                Best Uses

                • Mountain Biking

                Comments about Shimano M640 Zee Rear Derailleur:

                Upgraded my drivetrain to a 1x10 and matched my rear FR mech with a zee shifter.
                Brilliant shifting and quiet. Spot on.

                • Was this a gift?:
                • No

                (1 of 1 customers found this review helpful)

                 
                4.0

                Great Derailleur

                By Dan

                from Northeast US

                About Me Competitive Cyclist

                Verified Reviewer

                Pros

                • Attractive Design
                • Easy To Install
                • Lightweight

                Cons

                  Best Uses

                  • Mountain Biking

                  Comments about Shimano M640 Zee Rear Derailleur:

                  This derailleur is awesome. The shadow plus keeps the chain very quite. I've used mine with two different nine speed sram drivetrains, one on an AM bike and one on my DH bike. Both shifted well and I'm sure would shift even quicker with full shimano ten speed drivetrain. I did have the small piece of steel inside the clutch mechanism that the adjustment screw threads into snap after about three months of use. I just sent it to shimano and they sent me a whole new derailleur about two weeks later. I'm guessing my first had some sort of defect because my new one is great, however I have been to scared to open the shadow plus cover to adjust the clutch, but the tension is fine so I've never had a reason to yet.

                  • Was this a gift?:
                  • No

                  Displaying reviews 1-10

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