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  1. #1
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    3x10 big dummy impossible?

    So. Has anyone ever setup a dummy with a 10 speed cassette in the rear? I was all set to build a 3x10 speed dummy. Went to install my XT rear derailleur and encountered a problem. The shimano 10 speed RD has an arm that comes into contact with the dummy frame. This causes two problems. 1) There is a hole that shimano calls the "outer casing holder" where you insert your cable housing. This hole is blocked by the frame. It would be impossible to setup the cable and housing. 2) The frame will also prevent proper movement of the derailleur.

    Anybody out there with a 3x10 dummy? Would switching to s SRAM shifter and derailleur solve the problem?
    Attached Thumbnails Attached Thumbnails 3x10 big dummy impossible?-photo-2.jpg  


  2. #2
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    SRAM would probably alleviate the clearance issue.

    Meanwhile, I converted my Big Dummy to a 2x9 setup (32/22 x 11-34), since Iím often carrying heavy loads up steep hills. All I need to do now is figure out how to install some sort of chain anti-slap/anti-sway device since Iíve had a couple chain breakage problems due to the chain swaying side to side on rough terrain.
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  3. #3
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    You'll need a non-Shadow derailleur. I see that QBP has one at a Deore level, but it is out of stock at the moment.

  4. #4
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    Quote Originally Posted by Schmucker View Post
    You'll need a non-Shadow derailleur. I see that QBP has one at a Deore level, but it is out of stock at the moment.
    Thanks. I guess the "shadow" design intentionally connects the cable and housing direct behind the derailleur mount bolt so that everything is in the same plane.

  5. #5
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    I had the exact same problem when I bought a 3x10 SLX group for my Dummy.


    My non functioning 3x10 Dummy.

    What I did was get the XT trekking derailleur, which has the old style cable routing, but is still compatible with the Dynasys shifters, since I guess you have those already.


    My perfectly functioning 3x10 Dummy.

    EDIT: Link to the actual derailleur: Wiggle | Shimano XT T780 10-Speed Shadow Rear Derailleur | Rear Derailleurs

  6. #6
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    New question here. Why 3 X 10?

    Hi why 3 x 10?
    I'm running with 3 X 9 because 9 speed chain is stronger! a 9 speed Shadow derailleur works great.
    Please Note I live at the Top of a 400 metre Hill so needed a strong set up.

    Happy Riding...........

    Pete


  7. #7
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    Not that I necessarily doubt you, but:

    because 9 speed chain is stronger!

  8. #8
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    Quote Originally Posted by NZPeterG View Post
    Hi why 3 x 10?
    I'm running with 3 X 9 because 9 speed chain is stronger! a 9 speed Shadow derailleur works great.
    Please Note I live at the Top of a 400 metre Hill so needed a strong set up.

    Happy Riding...........

    Pete

    I chose a 10 speed drivetrain because I was able to transfer it from another bike so it didn't cost me anything out of pocket. I also believe that 9 speed component options will become more and more rare over the next couple of years. It looks like 11 speed is going to become the new mtb standard. I am afraid that in the next couple of years shimano and sram will stop manufacturing the 9 speed versions of their mid-level components (deore or X7). I mean look at 8 speed components. Not many options out there these days. I may be wrong but I figured maybe I could stay a little bit ahead of the curve by starting out with 10 speed.

  9. #9
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    Quote Originally Posted by perbl View Post
    I had the exact same problem when I bought a 3x10 SLX group for my Dummy.
    Thanks, perbl! I was trying to completely rule out user error on my part before I spent money on different setup. Glad to know someone has found a workable solution for 3x10. I will try to get ahold of the XT T780 RD or switch to an X7 setup.

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