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Old 08-16-04, 11:57 PM   #1
Roostalee
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XTR M950 rear derailleur compatibility

I've got an 8-speed drivetrain that I'm looking to upgrade to 9-speed since the my XTR shifters are broken and I'd rather not keep hunting down older 8-speed stuff. My question is, will the XTR M950 rear derailleur work with a 9-speed setup or were there limitations with the M950 that limited it to only eight speeds? I know the M952 and newer derailleurs were specifically designed for the newer setup as you could see "Mega 9" etched into the cage itself, but what about M950 rear?
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Old 11-28-08, 03:20 AM   #2
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Not to resurrect an old thread, but since there was no response to this one, thought I'd give it another go.

I also have an RD-M950 (medium cage) which I plan to use with an LX 9-speed shifter in a 1 x 9 setup with 32t up front and 11-34t in the back. My research shows conflicting opinions regarding using the RD-M950 with a 9 speed, maybe someone here can set the record straight.
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Old 11-28-08, 06:56 AM   #3
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I'd try it. As you know It's designed for an 8 speed chain, but if you have it indexed properly, It should work just fine.
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Old 11-28-08, 08:25 AM   #4
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I'd try it. As you know It's designed for an 8 speed chain, but if you have it indexed properly, It should work just fine.
+1. No problems as far as I know.
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Old 11-28-08, 08:58 AM   #5
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technically the derailleur is sposed to match the cassette, and since there are 8speed freehub bodies that are slightly shorter than 9speed bodies i would assume a 9 speed cassette is wider, However I think the derail should still have enough movement to cover all of that, I have an old 7speed rsx derail on my 9speed 11-32 tiagra cx bike and it works just fine, and thats not even a good derail, I imagine if I can do it with older lower end parts u'll be fine with xt.
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Old 11-28-08, 01:02 PM   #6
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Indexing occurs in the shifter, not the derailleur, so thats no problem. The derailleur can handle the range.. in fact I don't think the overall width is much different if at all.. but you may want to upgrade the pulleys to 9spd if thats possible, but it might not make a difference.
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Old 12-01-08, 10:40 AM   #7
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technically the derailleur is sposed to match the cassette, and since there are 8speed freehub bodies that are slightly shorter than 9speed bodies
This is incorrect
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Old 12-01-08, 11:29 AM   #8
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This is incorrect
+1. The width of 8sp and 9sp cassettes are the same, and the freehub bodies are likewise the same width.
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Old 12-01-08, 03:10 PM   #9
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9speed bodies work for 8 speed, but i replaced the freehub on my friends deore hub 4 days ago, and there where freehub bodies that work said 9 speed and ones that were shorter, I thought it said 8speed on it but its always possible it was a misslabled 7 speed
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