Shimano SLX Dyna-Sys RD-M663 Shadow Rear Derailleur

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SLX Dyna-Sys RD-M663 Shadow Rear

10 Speed MTB!Shimano SLX Dyna-SysTakes legendaryShimano shiftingToThe next level of perfection.The shadow design lessensThe changes of snagging a branch or clipping a rock whileThe direct cable routing lowers shifting effort.The wide pivots keep shifting smooth and consistent for 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 componentsThis derailleu

User Reviews (1)

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Mr.SJ   Racer [Apr 15, 2011]

Crisp shifts, works like XT (have a look at Shimamo´s technical documents!), looks good, tough and light enough. This XC/AM derailleur is a great allrounder.


None. Bad for Shimano: it´s really a good derailleur and you have not to empty your wallet for it.

I think, I have made a mistake in the past. I always thought it has to be XT minimum for race purposes, better XTR. Since I tried SLX Dyna-Sys just for fun I changed my point of view. Superperformance, what a waste of money in the past. So, save your money, invest it for a lightweight wheelset with fast, light tires, which will be much more effectice, and go out for a ride.

Similar Products Used: All Shimano derailleurs.
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