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Shimano SLX M663 Rear Derailleur

Item #: RD242A02
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Shimano SLX M663 Rear Derailleur

10 Speed MTB! Shimano SLX Dyna-Sys takes legendary Shimano shifting to the next level of perfection. The shadow design lessens the chances of snagging a branch or clipping a rock while the direct cable routing lowers shifting effort. The wide pivots keep shifting smooth and consistent mile after mile.
  • 10 speed MTB Dyna-Sys
  • Lightweight design
  • Direct cable routing for effortless shifting
  • Wide pivots for consistent shifting
  • Shadow design
  • Long cage
  • Optimized for use with Dyna-Sys components only
  • This derailleur is not backwards compatible, it will only work with 10 speed Dyna-Sys shifters
  • Weight: 273g
Please Note: This is marked an OE Item because it lacks original packaging. The item has never been installed or used.
4.5 / 5.0
13 Reviews
5 Stars
4 Stars
3 Stars
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1 Star
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I buy Shimano rear derailleur again
I Buy this Shimano SLX Sl-660-10 shifters and a SLX M663 Rear Derailleur to upgrade my Deore 27 speed system. I'm a one handed rider and I do not have time for troubles when I'm in the mountain. These shifters are very reliable, smooth and precise. I'm certain which gear I'm using even I remove the VDO part to accommodate both shifters and both brakes in one side of the handle bar. I feel happy and confident with this purchase.

PROS: Lightweight, Durable, Attractive Design
July 29, 2013
Location:
Queretaro, Mexico
smooth ... like it
Got this after old oem derailleur exploded on the trail. Looked at way too many reviews, and choose this because only $10 more on sale than a deore. Very happy with product, however would advise on putting $$$ into shifter first. This piece is too close to the action, and it is the shifter that really determines shift quality. For a few bucks more it is a no brainer to choose this derailleur.

Very impressed with quality, and strength of components. Should take more than a twig to take this one out. Has been a great compliment to my XT shifter. Smooth, instant shifting that has greatly improved ride satisfaction over oem components. Definitely beefier than the deore. Also the shadow design does get it out of the action in higher gears. Worth the upgrade.

And unless you are at 5% body fat don't tell me about ounces while your fat butt engulfs a seat ... Sorry don't get this non-pro weight obsession.

PROS: Easy To Install, Shadow Design
September 25, 2015
Location:
Atlanta, GA
much needed upgrade
I got this derailleur when I upgraded to a 10 speed from an 8 speed alivio set up. World of a difference in shifting this made. Crisp, clean shifts... and not to mention not having a chain drop since the switch! SLX is definitely in the sweet spot when it comes to the price/performance ratio.

PROS: Easy To Install, Attractive Design, Durable
March 4, 2013
Location:
Pearland, TX
Works great!
I was piecing together a frame and decided to go with a 1X10 setup and read about how great the clutch type derailleurs are. I was going to buy the ZEE free ride model for it's short cage but wasn't sure if I was going to stick with 1X10 or not since this is my first mountain bike in 10+ years. The derailleur came as described - sans retail packaging but was brand new and installed perfectly. Paired with a Zee shifter, this bike shifts GREAT uphill under load with me stomping on the pedals. Shifts are quick and positive and I heard no chain slap. Great deal!

PROS: Easy To Install, Durable

BEST USES: Mountain Biking, Casual Riding
November 5, 2013
Location:
Orange County, CA
easy to setup and durable
this thing is easy to setup, no need to tamper all around to make it work, and has the shimano seal for durability and dependability.

PROS: Attractive Design, Durable, Lightweight
August 15, 2014
Location:
Puerto Rico
Low bling - Great RD
Perfect.

PROS: Works Perfect, CHEAP

CONS: NONE

BEST USES: Racing, Mountain Biking
August 18, 2014
Location:
Minneapolis, MN
Great Derailleur
Buy an OE products and save money. Derailleur was new just without the original packaging.

PROS: Attractive Design, Easy To Install, Durable
April 2, 2014
Location:
Boulder, CO
Can't get any better
Arrive within days. Consider the distance

PROS: Durable, Attractive Design, Easy To Install
July 20, 2014
Location:
Puerto Rico island
Superb value
This completed my upgrade from 3x9 to 3x10.

PROS: Easy To Install
August 16, 2015
Location:
Israel
Great value
Great 10 speed rear derailleur. It´s a litle heavier than XT or XTR, but much cheaper.
It does the job great.
I wonder why shimano offers the same jockey wheels for all (inclusive high-end) derailleurs. I change those for a ceramic bearing Jockey wheels.

PROS: Attractive Design, Easy To Install, Durable

CONS: Heavy
July 10, 2015
Location:
Buenos Aires, Argentina

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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.