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Shimano M640 Zee Rear Derailleur

Item #: RD245C00
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 30 reviews)

Ratings Distribution

  • 5 Stars

     

    (16)

  • 4 Stars

     

    (13)

  • 3 Stars

     

    (0)

  • 2 Stars

     

    (0)

  • 1 Stars

     

    (1)

97%

of respondents would recommend this to a friend.

Pros

  • Durable (25)
  • Attractive (23)
  • Easy to install (21)
  • Lightweight (10)

Cons

    Best Uses

    • Mountain biking (27)
    • Upgrade (11)
    • Racing (4)
      • Reviewer Profile:
      • Avid cyclist (20), Casual/ recreational (5)
      • Was this a gift?:
      • No (28)

    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 30 customers

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    Displaying reviews 1-10

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    4.0

    First ride impressions

    By vfxMarlon

    from Reno, NV

    About Me Avid Cyclist

    Verified Buyer

    Pros

    • Attractive Design
    • Durable
    • Easy To Install

    Cons

      Best Uses

      • Mountain Biking
      • Upgrade

      Comments about Shimano M640 Zee Rear Derailleur:

      First time out on the bike after the upgrades and I have to say that this derailleur performed much better than I expected. The shifts were fast, crisp and accurate! I made sure to bring extra tools in case I need to make adjustments on the fly, but I never needed them.

      • Was this a gift?:
      • No
       
      5.0

      Used for one season, still happy.

      By Peter from Ottawa

      from Ottawa, ON, Canada

      About Me Avid Cyclist

      Pros

      • Durable

      Cons

        Best Uses

        • Mountain Biking

        Comments about Shimano M640 Zee Rear Derailleur:

        Bought this to set up a 1x10 drive on a IBIS Mojo HDR and I'm loving it. I ride pretty hard, and shift this thing up and down all ride long. It's been reliable all season, and still clicks through gears perfectly. I have it set up with the Zee cranks, and I'd like these to have less teeth. I'd be happeier with 32 or 30 for the conditions I ride.

        • Was this a gift?:
        • No
         
        5.0

        perfect for 10X1

        By Maryland

        from Raleigh, NC

        About Me Avid Cyclist

        Verified Reviewer

        Pros

        • Attractive Design
        • Durable
        • Easy To Install

        Cons

          Best Uses

          • Mountain Biking
          • Upgrade

          Comments about Shimano M640 Zee Rear Derailleur:

          I used this on my last bike build 1x10 setup. This works great! small cage keeps chain short and out of the roots and rocks

          • Was this a gift?:
          • No
           
          5.0

          Great Rear Mech for 1x10

          By Michael

          from PNW

          About Me Avid Cyclist

          Verified Reviewer

          Pros

          • Attractive Design
          • Durable
          • Easy To Install
          • Great performance

          Cons

            Best Uses

            • Mountain Biking

            Comments about Shimano M640 Zee Rear Derailleur:

            Awesome derailleur. Worked flawless for me all summer. Switched to 1x10 drivetrain last year and after bad luck with sram x7 and x9 type2 I decided to go back to shimano. I have been very happy with the switch. Clutch works great keeping good chain tension and shifting is crisp. Its short cage and low profile also keeps it nice and tucked away from potential snags and bashes. Paired this with an xt shifter and couldn't be happier with the combo.

            • Was this a gift?:
            • No
             
            5.0

            Switched from XT to Zee

            By Blur LT

            from Lake Forest CA

            About Me Avid Cyclist

            Verified Buyer

            Pros

            • Attractive Design
            • Durable
            • Easy To Install

            Cons

              Best Uses

                Comments about Shimano M640 Zee Rear Derailleur:

                I switched from xt derailleur to this Zee, and zero regrets, I think it's 20gr heavier but I like the look and how smoth it shifts.

                I bought the freeride style in order to use it with a 11-36 cassette.

                • Was this a gift?:
                • No
                 
                4.0

                about as good as it gets.

                By yetiking

                from Marin california

                About Me Competitive Cyclist

                Verified Reviewer

                Pros

                • CHEAP
                • Durable
                • Easy To Install
                • Low Profile

                Cons

                  Best Uses

                  • Mountain Biking
                  • Racing

                  Comments about Shimano M640 Zee Rear Derailleur:

                  i've been running one on my dh bike as well as my trail bike for 1.5 years now. not flawless, some tolerances are a little slack, but about as good as it gets, at a bottom price tag.

                  highly recommended.
                  sometimes the clutch comes a little weak from the factory and could use a half turn.

                  • Was this a gift?:
                  • No
                   
                  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

                        Displaying reviews 1-10

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