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  1. #1
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    Best 10 speed derailleur for 11-42

    Hello. Im upgrading to 11-42 10 speed cassette and want to know which derailleur will work better, Im basically looking at sram GX 2.1 and shimano XT RD-M786. Im also changing the shifter.
    Which cage size would you choose long or med.
    Thanks.
    Bernardo.
    Last edited by bernardo; 01-15-2019 at 01:08 PM.

  2. #2
    NedwannaB
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    Quote Originally Posted by bernardo View Post
    Hello. Im upgrading to 11-42 10 speed cassette and want to know which derailleur will work better, Im basically looking at sram GX 2.1 and shimano XT RD-M786. Im also chainging the shifter.
    Which cage size would you choose long or med.
    Thanks.
    Bernardo.
    What drivetrain setup do you currently have now? Shimano SLX 7000 or XT 8000 11 spd med cage up to 32t front ring, long cage probly better if going bigger than that.
    Wait whuuut, who did he tell you that!?!?....

  3. #3
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    I have 10 speed 11-40 (11-36 with 40 chainring) and GX 2 (not 2.1) and 30t front, works ok, not great.
    Bernardo

  4. #4
    Jan
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    I use a 10 speed XTR shifter and a M8000 GS derailleur. Works perfect.

  5. #5
    NedwannaB
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    Quote Originally Posted by Jan View Post
    I use a 10 speed XTR shifter and a M8000 derailleur. Works perfekt.
    Ditto. Except XT 10spd shifter/m8000 11spd der.👍
    Wait whuuut, who did he tell you that!?!?....

  6. #6
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    I would always go with shortest cage. My ZEE short cage was fine for 11-40 but not enough for 11-45 so I'm currently running M8000 mid cage.

    I've been learned that my ZEE should work with 11-42 I'm mostly now using and M8000 is wearing our... ZEE will get try before another M-series for sure.

    Why shortest cage? Less tendency to got RD to rocks etc in right places and fewer picked sticks turning it between spokes, my number one issue breaking RD hanger or twisting parts... not fun when racing or far far away from "service".

    BTW made offset pulley outer cage plate for ZEE and it was pretty much as good in operation for 11-40 cassette as M8000, and easy much more better handling any abuse

    Sent from my Mi A2 using Tapatalk
    Cheers,
    -Mika

  7. #7
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    So for what I understand I can use a 11 speed shimano derailleur (M7000 or M8000) and a 10 speed shifter and a 10 speed 11-42 cassette???

    Bernardo

  8. #8
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    Yes. Works great. Suggest XT shifter for best function and features vs. price.

  9. #9
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    why not go 11-speed? It can't save much money to use a rare 10-speed setup vs. a common 11-speed. That also gives you the option to go 11-46 etc.
    2018 Motobecane Sturgis NX
    2016 Giant Toughroad SLR1

  10. #10
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    Quote Originally Posted by HerrKaLeun View Post
    why not go 11-speed? It can't save much money to use a rare 10-speed setup vs. a common 11-speed. That also gives you the option to go 11-46 etc.
    Well, it's nice to get more gear range and consistent step between any two gears. But you've introduced more expensive chain which lasts way less real world mileage than 10s. Also anything more than 42 requires mid cage and here we go...

    My most cost effective and best working setup was 1x9 using Campy Record 9s chain, ZEE with diy offset cage and custom 11-40 cassette driven by SRAM X9 9s shifter.

    Would go back if could live with those two bigger steps in range...

    Sent from my Mi A2 using Tapatalk
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    -Mika

  11. #11
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    I run an XT M770-SGS rear der. with some BS78 10sp bar end shifters on my cross bike:
    https://www.4crawler.com/Photos/104_pana/CX700/3.html

    Originally with 11-36 and now with 11-42. I had to add a WolfTooth RoadLink adapter to clear the 42T cog.

    I go over the setup starting with this video on YouTube:
    https://youtu.be/ayzZLDJRs3k

  12. #12
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    I was lucky with my dropout/hanger combo to clear 40t with ZEE. But diy offset pulley cage did mostly same as adapter but it does better job.

    Sent from my Mi A2 using Tapatalk
    Cheers,
    -Mika

  13. #13
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    Quote Originally Posted by mhelander View Post
    I would always go with shortest cage. My ZEE short cage was fine for 11-40 but not enough for 11-45 so I'm currently running M8000 mid cage.

    I've been learned that my ZEE should work with 11-42 I'm mostly now using and M8000 is wearing our... ZEE will get try before another M-series for sure.

    Why shortest cage? Less tendency to got RD to rocks etc in right places and fewer picked sticks turning it between spokes, my number one issue breaking RD hanger or twisting parts... not fun when racing or far far away from "service".

    BTW made offset pulley outer cage plate for ZEE and it was pretty much as good in operation for 11-40 cassette as M8000, and easy much more better handling any abuse

    Sent from my Mi A2 using Tapatalk
    I used to think the same, but have recently started using long cage as it controls chain-slap better than mod cage.

  14. #14
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    Quote Originally Posted by mhelander View Post
    Well, it's nice to get more gear range and consistent step between any two gears. But you've introduced more expensive chain which lasts way less real world mileage than 10s.
    From bike-discount.de (sorry i'm in Europe):

    Shimano XT Chain CN-HG95 10-speed 116 Links: 20,17
    Shimano 11-Speed Chain CN-HG701 with Quick-Link: 24,44

    How much time does it take on minimum wage to earn that 4,27 price difference?

    Whoops, I just realised with the 11spd you're also getting a quick link instead of that stupid pin.

  15. #15
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    Correct.

    Quote Originally Posted by bernardo View Post
    So for what I understand I can use a 11 speed shimano derailleur (M7000 or M8000) and a 10 speed shifter and a 10 speed 11-42 cassette???

    Bernardo

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