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Shimano M640 Zee Rear Derailleur

Item #: RD245C00
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From USD$77.99 29% off USD$109.99 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

REVIEW SNAPSHOT®

by PowerReviews
Shimano M640 Zee Rear Derailleur
 
4.5

(based on 12 reviews)

Ratings Distribution

  • 5 Stars

     

    (6)

  • 4 Stars

     

    (6)

  • 3 Stars

     

    (0)

  • 2 Stars

     

    (0)

  • 1 Stars

     

    (0)

100%

of respondents would recommend this to a friend.

Pros

  • Attractive (9)
  • Durable (8)
  • Easy to install (8)
  • Lightweight (6)

Cons

    Best Uses

    • Mountain biking (11)
    • Upgrade (4)
      • Reviewer Profile:
      • Avid cyclist (8)
      • Was this a gift?:
      • No (11)

    Reviewed by 12 customers

    Sort by

    Displaying reviews 1-10

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    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
       
      4.0

      really clean shifter

      By james

      from jackson, ms

      About Me Avid Cyclist

      Verified Reviewer

      Pros

      • Attractive Design
      • Clearance
      • Durable

      Cons

      • Difficult to adjust

      Best Uses

      • 1x10
      • Mountain Biking
      • Upgrade

      Comments about Shimano M640 Zee Rear Derailleur:

      this derailleur shifts really well and is great on my 1x10 setup. it was kind of a pain in the butt to get it tuned the first time, but my bike mechanic finally got it dialled in. it has shifted clean ever since, (~500 miles or so) the short length is great in the rock gardens. all around solid piece. the FR does great with my XX 10 speed (11-36).

      • Was this a gift?:
      • No
       
      5.0

      so far pretty awesome

      By chad the rider

      from Vancouver BC

      About Me Avid Cyclist

      Verified Buyer

      Pros

      • Attractive Design
      • Durable
      • Easy To Install
      • Lightweight

      Cons

        Best Uses

        • Mountain Biking

        Comments about Shimano M640 Zee Rear Derailleur:

        yes the rumors are true. This is a great derailleur. I have ridden one day at whistler with it and i can't believe the the difference the clutch makes compared to my last years saint derailleur. no chain slap. quiet, precise shifting. And pretty darn light to boot.

        the best part? it is dirt cheap.

        • Was this a gift?:
        • No
         
        4.0

        ZEE IS ALL YOU NEED

        By Satisfied rider

        from Tampa, FL

        About Me Avid Cyclist

        Verified Buyer

        Pros

        • Attractive Design
        • Easy To Install
        • Lightweight

        Cons

          Best Uses

          • Mountain Biking
          • Trail riding
          • Upgrade

          Comments about Shimano M640 Zee Rear Derailleur:

          Replaced my X9 and went to single 32T. Zee was awesome out the gate. Trails in Alafia are very rooty and technical. Zee held up superbly! Cam was adjusted for tighter action. May have worked loose after a couple of rides but chain bairly moved. XTR for trail is overkill!

          • Was this a gift?:
          • No
           
          5.0

          great rear mech

          By Dudeman

          from Boone, NC

          About Me Avid Cyclist

          Verified Reviewer

          Pros

          • Attractive Design
          • Durable
          • Easy To Install
          • Lightweight
          • Smooth

          Cons

            Best Uses

            • Mountain Biking

            Comments about Shimano M640 Zee Rear Derailleur:

            This is by far the best rear derailluer I've used, far superior to the slx i had before it. The clutch technology is a nice feature and should be a good improvement. I thought the clutch would make shifting more difficult but i hardly notice it, keeps it mice and quite. I am using this with a 1x10 with a 11-36t cassette and it works fantastic. I went with the slx shifter instead of the zee because i am using this for trail riding and i don't need the ruggedness of the zee.

            • Was this a gift?:
            • No
             
            4.0

            Zee for 1x10

            By Fat_Polly

            from Denver, CO

            About Me Avid Cyclist

            Verified Buyer

            Pros

            • Crisp Shifting
            • Easy setup
            • Works Without A Hitch

            Cons

              Best Uses

              • Mountain Biking

              Comments about Shimano M640 Zee Rear Derailleur:

              Happy with my choice of a Shimano Zee shifter and rear derailleur for a 1x10 setup. The system works really well, haven't missed my 2x9 at all.

              • Was this a gift?:
              • No
               
              5.0

              Great Derailleur

              By Smitty

              from Bay Area, CA

              About Me Casual/ Recreational

              Verified Buyer

              Pros

              • Clutch
              • Durable
              • Easy To Install
              • Quiet

              Cons

              • NONE

              Best Uses

              • Mountain Biking
              • Upgrade

              Comments about Shimano M640 Zee Rear Derailleur:

              Great derailleur for the price. Keeps the drivetrain quiet and smooth

              • Was this a gift?:
              • No
               
              4.0

              m640 zee

              By oli

              from Las Vegas

              About Me Avid Cyclist

              Verified Buyer

              Pros

              • Attractive Design
              • Clutch System
              • Durable

              Cons

                Best Uses

                • Mountain Biking

                Comments about Shimano M640 Zee Rear Derailleur:

                Not sure if I set this up correctly, but if I go into the highest gear (smallest cog) I can't shift out of it. The chain catches on the c-clip on the derailer pivot.
                Otherwise Shifts fast and precise and the clutch mechanism keeps the chain on and everything quiet.

                Installed on Tomac Snyper 140

                • Was this a gift?:
                • No

                Displaying reviews 1-10

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