Shimano Zee M640 Rear Derailleur

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Shimano Zee M640 Rear Derailleur

The Shimano 10 speed Zee Rear Derailleur features Shadow Plus technology that significantly reduces chain noise, optimizes chain retention and offers a more stable drivetrain in general. If you love racing DH or you're a freeride specialist and you need a rear dearailleur that can withstand all the punishment those disciplines can inflict but your wallet can't deal with the punishment Saint will inflict on your finances, then the Zee Rear Derailleur just solved all your problems.

  • Shadow + clutch technology
  • Short cage
  • 10-speed only
  • Shadow RD technology: Super low-profile design

If you're interested in a Zee Rear Derailleur then chances are you'd also be interested in one of our full face helmets.

Showing Questions 1-4 of 4

Q: Will this derailleur work with a 11-36 10-speed cassette? If so, what chain works well with that setup?

A: Yup! This derailleur will work with 11-36 10 speed cassettes. You will have to choose the Free Ride (FR) version from the drop down menu.

Q: will this work with 42 cog wolf tooth, for a 1x 10 set up?

A: It will but you will have to choose the Freeride (FR) option from the drop down menu.

Q: How do I know which option I need to choose?

A: Please contact your frame manufacturer for more info. This RD would vary on the overall ring capacity that you have and can be checked by contacting Shimano or the frame manufacturer direct.

Q: Can I use this with a 9 speed shifter/cassette?

A: No, this derailleur is only compatible with Shimano DynaSys (10-speed) shifters.

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pros/cons - Mar 27, 2015

1 2 3 4 5
5 out of 5 stars
highlands ranch, CO

awesome derailleur, no chain popping off since installed, has an issue with 3rd gear makes a grating noise but all other gears are fine, but its probably just my chain length. on the heavier side but I highly recommend this derailleur.

0 out of 0 people found this review helpful
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good derailler - Apr 23, 2014

1 2 3 4 5
5 out of 5 stars
Madison, MS

it has been a bit difficult to tune, but i just realized my hanger was bent so that will probably change the tuning. has helped with chain drop. runs very quiet. all in all, shifts well under pressure. the short cage is great for 1x10.

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Mine had problems - Apr 20, 2014

1 2
2 out of 5 stars
Hesperia, CA

I ran this unit for about 4 months. It had problems shifting in the middle of the cassette, both up and down. It would also flex a bit and pop off the gear if I put too much pressure into it. Needless to say, I often sat down and shifted in fear of slamming to the ground from a chain popping off a gear. Do yourself a favor and get a Saint Derailleur - there is a night and day difference in their performance. If you don't need a short cage, the XT and XTR work great.

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Zee really is clutch - Sep 25, 2013

1 2 3 4 5
5 out of 5 stars
Knoxville, TN

I have been using this derailleur for a couple months. Before I used a clutch derailleur, I did not believe all the hype of how good the clutch derailleurs worked. Well, they are right, it makes the drivetrain much quieter and smoother. The clutch on/off lever makes taking the rear wheel off much easier as well. Overall a great product this far.

4 out of 4 people found this review helpful
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