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Shimano M640 Zee 10 SPD Rear Derailleur

Item #: RD245C00
From USD$46.99 SAVE 33% USD$69.99 msrp
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Shimano M640 Zee 10 SPD Rear Derailleur

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
4.7 / 5.0
90 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Stars
65
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1
Used for one season, still happy.
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.

PROS: Durable
November 18, 2014
Location:
Ottawa, ON, Canada
Great Rear Mech for 1x10
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.

PROS: Great performance, Durable, Easy To Install, Attractive Design
November 4, 2014
Location:
PNW
Nothing wrong everything right
I have no complaints about the Zee. Works fine and I'm using on a Wolftooth 1x conversion. It stretches enough for a 40T and shifts great. Can't even tell it's not stock. Using with XTR shifter and it's smooth as butter!

PROS: CHEAP, Works great, Attractive Design, Durable, Easy To Install

CONS: Heavy

BEST USES: Upgrade, Mountain Biking
February 10, 2015
Location:
Portland, OR
Switched from XT to Zee
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.

PROS: Easy To Install, Durable, Attractive Design
November 4, 2014
Location:
Lake Forest CA
perfect for 10X1
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

PROS: Easy To Install, Durable, Attractive Design

BEST USES: Upgrade, Mountain Biking
November 9, 2014
Location:
Raleigh, NC
Amazing
I have been riding a 1x9 setup on my Hardtail 29er MTB. The Zee derailuer has eliminated chainslap and losing the chain off the front ring. I have taken off the chain guide and gone to just a bash guard now...Love the tension settings available on the clutch...very sturdy!

PROS: Lightweight, Easy To Install, Durable, Attractive Design

CONS: None so far

BEST USES: Racing, Mountain Biking
December 18, 2012
Location:
Maryland
Great 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.

PROS: Easy To Install, Attractive Design, Lightweight
November 5, 2013
Location:
Northeast US
First ride impressions
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.

PROS: Easy To Install, Attractive Design, Durable

BEST USES: Mountain Biking, Upgrade
November 20, 2014
Location:
Reno, NV
Great short cage option
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.

PROS: Easy To Install, Durable, Lightweight, Attractive Design
August 4, 2014
Location:
Ontario Canada
Great value clutch type derailleur
Great value for a clutch type derailleur. I was able to install this onto a 9 speed SRAM setup using X5 front shifters and it works great. Unfortunately there are no 9 speed clutch type derailleurs but this one is doing the trick for me. The reduced chain slap is well worth the price.
March 30, 2016
Location:
CT

Q & A

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Browse 3 questions Browse 3 questions and 8 answers
Will it work with SHIMANO ZEE 10 spd RD-M640 SHADOW PLUS REAR DERAILLEUR ?
Jun S on Jan 8, 2017
Shimano M640 Zee 10 SPD Rear Derailleur
Shimano M640 Zee 10 SPD Rear Derailleur
Shimano SL-M670 10 Speed Shifter
Shimano SL-M670 10 Speed Shifter
BEST ANSWER: 100%. All Shimano mountain10spd shifter/mech combos work.
I am looking for 11-28t shimano cassette to pair with a new Zee 10 speed derailleur. What cassette do you recommend? (This will be mounted onto a Downhill Bike)
Marc36 on Jan 8, 2017
BEST ANSWER: You can use either Shimano or Sram cassettes with Shimano derailleurs. Shimano I don't think makes a MTB specific 11-28. Sram does. Shimano does make road derailleurs in 11-28. Ultegra and 105 group. They will also work. It just depends on what you want to spend.
can i use a 42t cogs in this derailleur?
Rean on May 7, 2017
Shimano M640 Zee 10 SPD Rear Derailleur
Shimano M640 Zee 10 SPD Rear Derailleur
Sunrace MX3 10 Speed Cassette
Sunrace MX3 10 Speed Cassette
BEST ANSWER: Shimano specs a 36T max on this derailleur. You may have more luck with the newer SLX M7000 derailleur instead.
Shimano SLX RD-M7000 11S Rear Derailleur
Shimano SLX RD-M7000 11S Rear Derailleur

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Free Shipping Offer

Get free Standard Shipping with your $50 purchase today! Just choose Standard Shipping during checkout.

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.