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  1. #1
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    2x10 and DynaSys

    Does anybody know if the DynaSys lever makes any difference in 2x10 setup?

    I just recently paid attention that I have this DynaSys on my XT rear derailleur (yeah, I know, it's dumb not to notice that, especially considering I'm making all the tuning by myself). However, from what I read and learn from the web, the system is built for 3x10. So my question is, since I can't find any straight forward answer.

    I use 2x10 Shimano XT 38-26 front, standard 11-36 rear. Do I need the DynaSys lever in on or off position?

    Thank you.

  2. #2
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    There is a gear selector on the bottom of the front shifter to select between a 2 or 3 ring setup. IIRC correctly the shifter needs to be in the smallest chainring to make the switch.

  3. #3
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    Are you talking about the lever on the derailleur body? If so, it can be run in either the on or off position as you prefer. When it is on, it tensions the chain to help stop it falling off the chainrings up front. You can run 1,2 or 3 chainrings with it.

    Dyna-sys is just Shimano's name for their 10 speed componentry, not the actual lever itself. XT Shadow Plus is the name of the actual clutch equipped derailleur.
    I don't crash, I just have slightly uncontrolled dismounts!

  4. #4
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    Quote Originally Posted by Kiwiplague View Post
    Are you talking about the lever on the derailleur body? If so, it can be run in either the on or off position as you prefer. When it is on, it tensions the chain to help stop it falling off the chainrings up front. You can run 1,2 or 3 chainrings with it.
    Yes! Thank you! Though I don't understand fully what you mean when you say "to help stop it falling off the chainrings up front". Does that mean that gear changes will be snappier due to the tension? Why would the chain fall off the chainrings?

    Sorry for the dumb questions...

  5. #5
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    Read this - Shimano XTR Shadow Plus Rear Derailleur ? First Ride Review - BikeRadar
    It will explain it much better than I can. (tired and can't do big words at the moment)
    I don't crash, I just have slightly uncontrolled dismounts!

  6. #6
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    Wow, thank you. I couldn't find it by myself.

    So the bottom line is, the DynaSys prevents chainslaps and chainoffs due to higher tension, and the number of front rings is irrelevant. Am I right?

  7. #7
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    Correct. The only time I ever turn mine to the off position is when I am removing the chain. If you leave it turned on it makes getting the rear wheel off really difficult!
    Another link worth looking at as well - Trail Tech: How To Adjust The Clutch Tension In Your Shimano Shadow Plus Rear Derailleur - BikeRadar
    Hope this all helps
    I don't crash, I just have slightly uncontrolled dismounts!

  8. #8
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    I'd kiss you for the second link if I could, in the most non-gayish way.

  9. #9
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    Thanks (I think).
    Glad to have helped.
    I don't crash, I just have slightly uncontrolled dismounts!

  10. #10
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    Quote Originally Posted by Aba Grizzly View Post
    Wow, thank you. I couldn't find it by myself.

    So the bottom line is, the DynaSys prevents chainslaps and chainoffs due to higher tension, and the number of front rings is irrelevant. Am I right?
    NO, dyna-sys is 10spd, Shadow Plus is the lever on your rear derailleur

  11. #11
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    Thanks, that means I misunderstood the whole concept?

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