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Old 05-20-12, 02:11 PM   #1
rfields
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road 10 spd shifter with Mt. 10 spd derailleur and cassette

Before I get too frustrated, can anybody tell me if a shimano XT 10 spd derailleur and cassette will work with a 10 speed ultegra (road) shifter?
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Old 05-20-12, 02:37 PM   #2
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No, the XT 10-speed rear derailleur requires a DynaSys-type rear shifter (there are currently no DynaSys road shifters). My first pick for your situation is the XT RD-M771. Note that it doesn't have a barrel adjuster, so if your frame doesn't have a barrel adjuster, get an inline barrel adjuster while you're at it.
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Old 05-20-12, 02:40 PM   #3
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The Ultegra 10-speed brifters will work with the MTB cassette but, as mechBgon said, they will not work with the new 10-speed MTB rear derailleurs.
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Old 05-20-12, 03:08 PM   #4
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So if I've understood correctly, I have to change to a XT RD-M771 rear derailleur. Will I be able to utilize all 10 cogs on the cassette or???
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Old 05-20-12, 03:15 PM   #5
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So if I've understood correctly, I have to change to a XT RD-M771 rear derailleur. Will I be able to utilize all 10 cogs on the cassette or???
If you'll be using a mountain derailleur, the primary thing is for it to move the right distance from cog to cog when the shifter moves one click. Shimano's 9-speed mountain derailleurs share the same movement pattern as their 10-speed road derailleurs, so any 9-speed Shimano mountain RD would be a basic match and let you use all the cogs. I think the traditional dual-servo designs (that's Shimano's lingo) will track the cassette cogs more closely than the Shadow variants and provide you with better results, so I suggested one of that type, the 771. But it's just one of the possibilities... there's also the XTR RD-M971 as the top-of-the-line option, or various models below XT too.

When shopping around for a viable RD, also note that there's backwards-sprung variants that default to the inboard rear cog, instead of the outboard rear cog. Most people do NOT want the backwards derailleur (aka the "low-normal" or "RapidRise" type), so be careful which you choose. Easy visual guideline: the backwards derailleurs have their cable-clamp bolt on the inboard link of the parallelogram rather than the outboard link.

Last edited by mechBgon; 05-20-12 at 03:19 PM.
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Old 05-20-12, 03:31 PM   #6
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Thank you mechBgon and hillRider for your help and insight. This will cure my problems with this bike.
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Old 05-20-12, 04:43 PM   #7
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I think I would rather have a rear derailleur with a barrel adjuster, just more convenient. Various XT and LX models are available. I would also avoid "rapid rise." The LX 661 trekking rd looks a little less mtn bike but it's harder to find except on ebay.
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Old 08-14-12, 06:58 PM   #8
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Will an XTR Shadow Rear Derailleur work with my Dura Ace shifters? I have a cross bike and I need 30 in the rear. My knees and legs are getting old and it would really help me climb some steep hills in Marin. TIA. Mike
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Old 08-14-12, 09:34 PM   #9
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Will an XTR Shadow Rear Derailleur work with my Dura Ace shifters? I have a cross bike and I need 30 in the rear. My knees and legs are getting old and it would really help me climb some steep hills in Marin. TIA. Mike
A 9-speed XTR Shadow would. A 10-speed XTR Shadow wouldn't. In the bigger picture, I recommend an Ultegra RD-6700A for your purpose instead. It's compatible with 30-tooth cassettes and will track the cassette more closely than a Shadow: http://www.aebike.com/Ultegra-6700-A_c_14862.html
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