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Shimano M640 Zee Rear Derailleur
Item #: RD245C00
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USD$79.99 27% 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 lines.
- 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 Cog Capacity
- FR spec - 36t Cog Capacity
- Chain Wrap Capacity: 25T (both DH and FR spec)
- Actual Weight: 268g
REVIEW SNAPSHOT®
by PowerReviewsShimano M640 Zee Rear Derailleur
(based on 8 reviews)
Ratings Distribution
100%
of respondents would recommend this to a friend.
Pros
- Attractive (5)
- Durable (5)
- Easy to install (5)
- Lightweight (4)
Cons
Best Uses
- Mountain biking (7)
- Reviewer Profile:
- Avid cyclist (6)
- Was this a gift?:
- No (7)
Reviewed by 8 customers
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Displaying reviews 1-8
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
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
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
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
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
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
Pros
- Attractive Design
- Durable
- Easy To Install
- Lightweight
Cons
- None so far
Best Uses
- Mountain Biking
- Racing
Comments about Shimano M640 Zee Rear Derailleur:
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!
- Was this a gift?:
- No
Bottom Line Yes, I would recommend this to a friend
Images shared by Ed
Zee Rear Derailuer
Images shared by Ed
Zee Rear Derailuer
(1 of 1 customers found this review helpful)
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Comments about Shimano M640 Zee Rear Derailleur:
Got this derailleur not to long ago for my trail 1x10 hard-tail and it has been working flawlessly. This is essentially an slx derailleur in short cage.
I have it set up with the saint shifter which is also fantastic.
The clutch has taken away all the chain slap which was annoying when it hit my carbon frame.
Displaying reviews 1-8
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Get free shipping with your $50 purchase today when you choose Standard Shipping at 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
