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  1. #1
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    XTR M9000 rear derailleur with XT M8000 11-42t cog any issues?

    Hi this is my first post. And I'm trying to piece together my SB6c components

    So i been reading around and haven't been able to find any info on
    if a XTR M9000 rear derailleur would work on a XT m8000 11-42t cog.

    From the info i can gather on CC it says the Rear derailleur can only handle up to a 40T, but i seen people run them on XX1 cogs. So I'm assuming it should work on the XT 11-42T cog.

    If anyone has any info on this or tried it i would greatly appreciate it.

    Danny

  2. #2
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    The catalog specs say it will not work. 30+ years of Shimano history says the max cog and capacity ratings of their derailleurs are conservative and you can exceed them by a couple teeth if you know how to adjust a derailleur.

    The 10s derailleurs have a max cog of 36, and people have been able to get them shifting a 42t conversion cog.

  3. #3
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    Sweet thanks. for the help

  4. #4
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    Quote Originally Posted by Joules View Post
    The catalog specs say it will not work.
    Wrong, check official info here.

    RD-M9000-SGS and RD-M9000-GS support 42T in 1x11 (only).

    I guess they updated the spec recently since only as of now they offer a 42T cassette.

  5. #5
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    Quote Originally Posted by madskatingcow View Post
    Wrong, check official info here.

    RD-M9000-SGS and RD-M9000-GS support 42T in 1x11 (only).

    I guess they updated the spec recently since only as of now they offer a 42T cassette.
    Wow thanks for the find. i was going off of ChainReaction and competitive cyclist site.

    Now i don't have to worry about if the rear derailer i ordered is going to work or not.

  6. #6
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    I have been running XTR 9000 RD with XX1 10-42 without ANY problem for about 4 months now


    Sent from my iPhone using Tapatalk

  7. #7
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    If the derailleur works with a 42 tooth cog on an 11 speed why wouldn't it work on a 42 tooth 10 speed?

  8. #8
    formerly shabadu
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    Because you'd be using a 10sp shifter?

  9. #9
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    Quote Originally Posted by flowtron View Post
    Because you'd be using a 10sp shifter?
    I'm running a XTR M9000 11 speed rear derailleur with my 10 speed XTR shifters and an IRD 11-40 tooth 10 speed cassete and it works flawlessly. I'm just trying to figure out why it would work on a 11 speed cassette with a 42 tooth cog and why it won't work on a 10 speed cassette with a 42 tooth cog - it either has the travel for the 42 tooth cog or it doesn't and the number of cogs shouldn't make a difference.

  10. #10
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    Quote Originally Posted by madskatingcow View Post
    Wrong, check official info here.

    RD-M9000-SGS and RD-M9000-GS support 42T in 1x11 (only).

    I guess they updated the spec recently since only as of now they offer a 42T cassette.

    And now at that link they are saying it supports 46t in 1x11.

    Iím updating this information in case someone comes upon this in a search. I know itís an old thread.

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