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  • Shimano Zee M640 Shadow+ 10 Speed Rear Mech
  • Shimano Zee M640 Shadow+ 10 Speed Rear Mech
NOW$67.49
  • RRP$89.99
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32-36t - Wide Ratio
23-28t - Close Ratio
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Shimano Zee Rear Derailleur 10 Speed M640

The Zee RD-M640 features Shadow Plus technology proven to reduce chain slap, drop and impact noise and the 10-speed short cage RD’s low profile tucks safely below the cassette cogs. With two spec options that enable a typical MTB cassette (11-32,11-34,11-36) or a close ratio road cassette (11-23,11-25,11-28), Zee is ready to handle the needs of enduro and DH racers.

10-speed also offers complete compatibility with Dyna-Sys MTB product and Shimano’s latest chain and cassette technology.

Shimano introduces Zee, a new line of gravity components that are an ideal starting point for aggressive riders and racers. Zee is the gateway gravity component line that allows riders to get on board with Shimano’s gravity program and experience premium new component technologies at a price they can afford.

Buy Shimano Zee Rear Derailleur 10 Speed M640 from Chain Reaction Cycles, the world's largest online bicycle store.

  • Colour: Black
  • Size: 32-36t - Wide Ratio, 23-28t - Close Ratio
  • Speed: 10 Speed
Rated 4.8 out of 5 by 93 reviewers.
Rated 5 out of 5 by Great piece of kit Such a great rear mech it will be hard to find one of better quality and value for money. 23 July 2014
Rated 5 out of 5 by Amazing! This is by far the best deraileur I have owned. It completely eliminates and sag in the chain and prevents all chain slap, a worthy but 18 July 2014
Rated 4 out of 5 by (initial review) Great features I just installed the derailleur and it seems to work great. I converted from a 3x9 to a 1x10 and so far the derailleur is everything that i thought it would be and more. I will do another review once i have a chance to fully try it out on the trails. 14 July 2014
Rated 5 out of 5 by wicked bit of kit Well put it this way its even compatable with a 9speed sram X9 shifter and cassette all i have to say..! Eventually changed my cassette to a shimano XT and a sram 5070 chain shifting is super quiet and smooth no clunking like the sram cassette and rear mech 14 July 2014
Rated 5 out of 5 Superb Rear Mech Very easy to install even if your newbie. Works flawlessly and fits on the budget. 05 July 2014
Rated 5 out of 5 by Didnt realise how good it was! I used to have a Sram X7 derailleur on my DH bike which wasn't the best. It done the job alright but is was a bit big and there was a lot of chain slap. Now i have Upgraded to this Rear Mech which was recommended to me b a friend. It is incredible, it is very durable, quite small and very quiet due to the special clutch mechanism . I recommend this to any riding Downhill or freeride. 05 July 2014
Rated 4 out of 5 by Doesn't skip a beat Does exactly what it says on the tin, clutch feature works well haven't dropped the chain yet. Can't fault shimano as per usual. Wasn't expecting the performance it gives especially not for such a low price point. 03 July 2014
Rated 5 out of 5 by Best price/value there is might look a bit "plastier" than the saint but works perfectly... 30 June 2014
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25 Questions : 50 Answers

Product Q&A

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4 answers

Which one?

Hi, I was wondering what the 32-36t stands for, is it for links on your chain or what else could it be? Thank you!
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2 months, 1 week ago
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Answer: 
Hey, it refers to your cassette range - 11 teeth at the small end, and 36 teeth at the big end.
The 23-28t close ratio is what you'd have on a downhill bike - not friendly at all for pedaling uphill!
If you're riding anything other than a downhill bike, then chances are you've got an 11-36ish cassette (it could be 11-32, 11-34 or 11-36 - it's just saying that the cage will reach all the way up to a 36 tooth gear), so get the wide ratio option.
Be warned, however, that this mech will only work on a 1x10 set-up. ie. you can only have one chainring up front on the cranks, If you have a front derailleur at all, then this won't work - just get an SLX mech in this case.
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Answer: 
It is the range of teeth on the largest sproket of the rear cassette:

"enable a typical MTB cassette (11-32,11-34,11-36) "
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Answer: 
The '32-36T' stands for 32 to 36 tooth. It's the wide ratio version of the Zee derailleur, which will accommodate rear cassettes with large sprockets of between 32 and 36 teeth. So if you're running, say, an 11-34t cassette, your largest rear sprocket is 34t - so you'll need the wide ratio mech. If your cassette has a large sprocket of between 23 and 28 teeth (generally a pure downhill setup) go for the close ratio.
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Answer: 
Its teeth on the cassette. If you have a wide range cassette (most mountain bikes do) the biggest cog will have 32, 34 or 36 teeth
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If I got the wide ratio one could I put it on a 2008 kona stinky (180mm travel) with an 11-36 cassette ?
2 weeks ago
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Answer: 
Yeah you should be able to can't think of any reason why it wont
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Answer: 
Yes with a but. You either have to get one that has the slightly longer bracket or get a normal one and change the bracket yourself. The picture is of the new bracket details.
Any dealer in the UK that is stocked via Madison can get the part for you (Shimano part no. Y50Y89010)
When you change it, please ensure that you remove the E-clip before attempting to remove the hex bolt.
Once you have the appropriate bracket version of the Zee mech it will work extremely well on your Stinky as it has on mine for nearly 2 years now.
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Answer: 
ive got it on my kona stinky and with a 11 36 and its fine as it is
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I want to use the middle and granny ring up front (so not the largest ring) and a 10 speed (11-36) cassette. will this work?

if not why? becasue the 2nd ring up front is a smaller ring not a bigger one and it would work with just the middle so why not the granny as well?

Thanks
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Answer: 
Compatibility with a Short Cage mech comes down to chain movement and how much chain slack that the mech can control.

If running a 2x10 setup this mech will have great difficulty in performing consistent, accurate shifting and will ultimately fail within the drivetrain. This is due to the amount of chain slack that is required to be tensioned to serve the purposes of shifting between the two front chain rings.

Shimano do not recommend using this mech with any setup other than a Single ring crankset. Ultimately this is advice worth taking into account.

The suggested mech below is available in a Medium Cage and also has a similar Clutch mechanism as the Zee; which benefits chain retention.
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Answer: 
In the granny ring, there won't be enough cage length to take up the chain tension, so the chain will hang slack.
Won't work at all - you'll need a medium or long cage. So, not a Zee, but a Zee is really just a short cage SLX mech, so just grab one of those.
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Answer: 
No; SRAM mechs use a 1:1 ratio cable pull, while Shimano runs 2:1, so a SRAM Shifter will not work with a Shimano rear derailleur and vice versa. You will have to use a SRAM rear mech with a SRAM shifter.
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Answer: 
Yes, Im currently running mine with a 9spd Sram X7 shifter, had no trouble adjusting the gears so that they work as well together as a shimano shifter. Been running it for nearly a year now and had no problems what so ever.
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2 answers

cassette

Any cassette recommend? Most 11-28 teeth are 9 speed
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Answer: 
Ultegra do a 11-28 in 10 speed and lighter than xt too.
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Answer: 
For an 11-28t cassette; Shimano recommend using a Road cassette. See the suggestions below -
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if i run a zee 10speed shifter and derailer, can i still run a 9 speed cassette? the cassette is 11-28 teeth 9 speed
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Answer: 
No as the gap changes between 9 and 10 speed and it would never mesh correctly,shimano also changed the pull ratio on 10 speed so you can't even use 9 speed shifters on 10 speed mechs.
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Answer: 
No, that won't work at all. You'll need a 10 speed cassette and chain - something like the SLX stuff I've added.
However, you might be able to run the Zee mech with a 9 speed shifter - provided there's enough clearance in the cage for the wider 9 speed chain.
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Answer: 
It'll work ok with the Sram cassette, but it's iffy whether you'll get away with the 40t.
Officially they'll only handle a 34t, but it runs fine on my 36t (if a little noisy in that gear.)
I'm sure it would work, but a bigger problem would be the potential for it to not have enough chain tension in the 11t.
You'd be safer with an SLX medium cage - it's really the same as the Zee mech, with a few extra mm on the cage.
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Answer: 
Yes this setup should be fine.

The instructions for fine tuning this cassette setup can be found here -

http://lnk.nu/cdn.hopetechnology.ne...
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Answer: 
Shimano 10 speed is a different cable pull ratio to 9 speed so it is not possible to run a 10 speed rear mech with a 9 speed drive train and shifter.
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Answer: 
It is not possible to run it with a Shimano 9 speed shifter but with personal experience and through the feedback on various forums, it would work on a 9 speed Sram Shifter.
some people have recommended placing a 6mm spacer on the cable clamp area to increase shifting accuracy while using the Shimano D to Sram Shifter set up.
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will it work with a 42thoth cog

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Answer: 
The largest cog/sprocket that this derailleur can handle is a 40T sprocket included as part of a modified cassette.
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Answer: 
36t - max (shimano spec)

I use 32t with wide ratio version - work fine
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Hope 40 t expander

Hi im using an 11-36 cassette with a hope 40 expander and a 32 t single chain ring. Would this derailleur work?
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Answer: 
Hi. I have the same set-up and the FR (wide ratio) version of the Zee works flawlessly.
I have 140mm travel on my rear shock with 22mm chain growth so I can't say how it would work on a longer travel bike.
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Answer: 
Yes; this setup should be fine.
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