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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 24 reviews)

Ratings Distribution

  • 5 Stars

     

    (12)

  • 4 Stars

     

    (11)

  • 3 Stars

     

    (0)

  • 2 Stars

     

    (0)

  • 1 Stars

     

    (1)

96%

of respondents would recommend this to a friend.

Pros

  • Attractive (19)
  • Durable (19)
  • Easy to install (16)
  • Lightweight (10)

Cons

    Best Uses

    • Mountain biking (22)
    • Upgrade (9)
    • Racing (3)
      • Reviewer Profile:
      • Avid cyclist (15), Casual/ recreational (5)
      • Was this a gift?:
      • No (22)

    Most Liked Positive Review

     

    Great Looking but Miss-Shifting

    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...Read complete review

    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.

    VS

    Most Liked Negative Review

     

    Huge letdown

    I wanted to love this product. When you first put it on its the coolest, but wait until it needs the first adjustment.

    The clutch when set to on is...Read complete review

    I wanted to love this product. When you first put it on its the coolest, but wait until it needs the first adjustment.

    The clutch when set to on is so stiff, it causes the main derailleur spring to be the weak spot. So through the rough stuff instead of the arm moving the whole derailleur does. After some use in top gear at the bike park this effectively hammers the high limit screw into a mushroom, and after further adjustment the screw eventually bends and the derailleur gets louder as it goes.

    I cut out the limit screw and replaced it with a hardened aftermarket piece, shortly after the body itself cracked along the limit screws.

    This design flaw just kills the product for me, negating all of the features and benefits shimano designed in. The saint has a built in bump stop...wonder why

    Reviewed by 24 customers

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    Displaying reviews 1-10

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    5.0

    Silence of the chain

    By Von

    from Los angeles

    About Me Casual/ Recreational

    Verified Buyer

    Pros

    • Attractive Design
    • Durable

    Cons

      Best Uses

      • Mountain Biking
      • Upgrade

      Comments about Shimano M640 Zee Rear Derailleur:

      Great product for the price. I switched over from a SRAM x9 setup that I was having trouble with. Namely chain slap and chain drop. Albeit the x9 was a long cage and the zee is a short cage.

      Love it so far. Works, cheap, and from Jenson. What more?

      • Was this a gift?:
      • No
       
      5.0

      Great Derailleur! great value!

      By Beamer

      from OH

      About Me Avid Cyclist

      Verified Buyer

      Pros

      • Crisp Shifting
      • Durable
      • Easy To Install
      • Gained Clearance
      • Less Chain Slap

      Cons

        Best Uses

        • 1 X 10 Setup
        • Long Travel 29er
        • Mountain Biking
        • Racing
        • Upgrade

        Comments about Shimano M640 Zee Rear Derailleur:

        Converted my LT Scott 29er to 1 x 10, running the FR one with a 34NW ring up front (11-36) in the rear, gained alot of clearence in the back and with the clutch it runs so smooth and crisp no slap.
        The tricky part is getting the chain length right with out to much slack on the chain thru the gears! Make sure you fully compress the suspension when adjusting the chain length! makes it much easier.

        • Was this a gift?:
        • No
         
        1.0

        Huge letdown

        By Jewpowered

        from Sandy eggo

        About Me Casual/ Recreational

        Verified Reviewer

        Pros

        • CHEAP

        Cons

        • Not Durable
        • Not Quiet For Long

        Best Uses

        • Frustration

        Comments about Shimano M640 Zee Rear Derailleur:

        I wanted to love this product. When you first put it on its the coolest, but wait until it needs the first adjustment.

        The clutch when set to on is so stiff, it causes the main derailleur spring to be the weak spot. So through the rough stuff instead of the arm moving the whole derailleur does. After some use in top gear at the bike park this effectively hammers the high limit screw into a mushroom, and after further adjustment the screw eventually bends and the derailleur gets louder as it goes.

        I cut out the limit screw and replaced it with a hardened aftermarket piece, shortly after the body itself cracked along the limit screws.

        This design flaw just kills the product for me, negating all of the features and benefits shimano designed in. The saint has a built in bump stop...wonder why

        • Was this a gift?:
        • No
         
        5.0

        Perfect for 1x10!

        By Shyamrox

        from Cincinnati, OH

        About Me Casual/ Recreational

        Verified Buyer

        Pros

        • Attractive Design
        • Durable
        • Easy To Install

        Cons

          Best Uses

          • Mountain Biking

          Comments about Shimano M640 Zee Rear Derailleur:

          First time using a clutch-type derailleur - its great!

          • Was this a gift?:
          • No
           
          5.0

          Zee derailleur review

          By Forrest gimp

          from Virginia

          About Me Avid Cyclist

          Verified Buyer

          Pros

          • Attractive Design
          • Durable
          • Easy To Install
          • Lightweight

          Cons

            Best Uses

            • Mountain Biking
            • Upgrade

            Comments about Shimano M640 Zee Rear Derailleur:

            I've been running a 1x9 using a jump stop & bash guard to keep my non clutch derailleur from throwing the chain . I bought the zee derailleur because of the great price point & other positve user reviews.
            After many successfull test runs , I was able to lose the jump stop & bash! I have a narrow / wide race face 30t ring. Combined with the zee no dropped chain & very very minimal chain slap .

            • Was this a gift?:
            • No
             
            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

                    Displaying reviews 1-10

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                    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.