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Discussion Starter #1
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
 

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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.
 

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Discussion Starter #5
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.
 

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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
 

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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?
 

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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.
 

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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.

I’m updating this information in case someone comes upon this in a search. I know it’s an old thread.
 
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