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XTR 11-40 11 spd cassette on DA 9100?

Posted: Mon Mar 18, 2019 4:16 am
by SilentDrone
I have mechanical DA 9100 with an 11-30 cassette. I’ve been thinking I’d pick up an ultegra 11-34 to go a bit lower. But before I do that I thought I’d see if anyone has tried to use the XTR 11-40 CS-M9000 with this DA group. I happen to have a slightly used XTR cassette already, just sitting around gathering dust.

Has anyone tried the XTR cassette? What did you find?


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XTR 11-40 11 spd cassette on DA 9100?

Posted: Mon Mar 18, 2019 4:16 am
by Weenie

Re: XTR 11-40 11 spd cassette on DA 9100?

Posted: Mon Mar 18, 2019 4:26 am
by ChiZ01
you will need a roadlink to fit 40t, but 40t on a road double is abit excessive

Re: XTR 11-40 11 spd cassette on DA 9100?

Posted: Mon Mar 18, 2019 4:30 am
by pdlpsher1
The Ultegra GS is better suited because it has a longer cage. That way if you accidently shift into the big-big combo you won't rip off your RD and possibly damage your frame. With the GS you won't need a RoadLink. I'm running the GS along with an XT 11-40 on my tandem. No RoadLink is needed and shifting is perfect. Can run both small-small and big-big gear combos no problems.

Re: XTR 11-40 11 spd cassette on DA 9100?

Posted: Mon Mar 18, 2019 4:48 am
by SilentDrone
ChiZ01 wrote:you will need a roadlink to fit 40t, but 40t on a road double is abit excessive
Yeah, good point. The 40 might be lower than I need.


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Re: XTR 11-40 11 spd cassette on DA 9100?

Posted: Mon Mar 18, 2019 4:50 am
by SilentDrone
pdlpsher1 wrote:The Ultegra GS is better suited because it has a longer cage. That way if you accidently shift into the big-big combo you won't rip off your RD and possibly damage your frame. With the GS you won't need a RoadLink. I'm running the GS along with an XT 11-40 on my tandem. No RoadLink is needed and shifting is perfect. Can run both small-small and big-big gear combos no problems.
Thanks for the quick response! I think if I get the 11-34 it would probably be a good idea to also get the log cage ultegra derailleur, although the shop tells me the short DA derailleur will be fine up to 34.


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Re: XTR 11-40 11 spd cassette on DA 9100?

Posted: Mon Mar 18, 2019 6:09 am
by Lelandjt
Different frames have slightly different derailleur mounts so your results may vary but on most bikes 9100 needs the Roadlink while 8000 GS works stock. That's how we do it at Santana Tandems.

Re: XTR 11-40 11 spd cassette on DA 9100?

Posted: Mon Mar 18, 2019 8:27 am
by alcatraz
The 30t is well suited for that RD. Just as a 34t is well suited for an r8000gs mid cage. When you deviate you sacrifice shift quality by the size of the deviation. (regardless of the chainwrap or cog clearance being sufficient).

Re: XTR 11-40 11 spd cassette on DA 9100?

Posted: Mon Mar 18, 2019 8:35 am
by Ritxis

Re: XTR 11-40 11 spd cassette on DA 9100?

Posted: Mon Mar 18, 2019 11:41 am
by deepakvrao
Lelandjt wrote:
Mon Mar 18, 2019 6:09 am
Different frames have slightly different derailleur mounts so your results may vary but on most bikes 9100 needs the Roadlink while 8000 GS works stock. That's how we do it at Santana Tandems.
You mean an Ultegra takes a 40 without a hanger extender? Then would the 8050 Di2 GS also have the same capability?

Re: XTR 11-40 11 spd cassette on DA 9100?

Posted: Mon Mar 18, 2019 11:55 am
by alcatraz
The op should look into getting an 11-34t + gs derailleur and swap the crank for an adventure crank like 46/30t.

Then shift quality is preserved.

If you try to put a 40t you wont be able to shift to the 10th cog from the 11th, the chain will just be rattling forever. The cassette to guide pulley distance is too large at the small cogs and if you try to decrease it you'll grind the pulley against the 1st cog.

On sram 10s (and some 11s) it's possible to mix mtb derailleurs with road shifters. Then you can put 42t cassettes and so on. The derailleur is then designed for the cassette.

Re: XTR 11-40 11 spd cassette on DA 9100?

Posted: Mon Mar 18, 2019 11:57 am
by naylor343
I would suggest you buy or borrow the cassette you want to use and try it before you splash your cash on a new rear derailleur. I can run an 11-34 using an 6870 short cage mech. It is all dependant on the combination of chain stay and rear hanger dimensions as to whether or not you can get that combination of both chain length and tension to run without issues. In my case I am on a 2010 TCR Adv SL size M/L and due to pure luck in the dimensional maths,it works, even large-large is able to cope without damage if I were to accidentally hit the wrong shifter. I only use this combo as I live in an incredibly hilly location and this allows me to have a super easy day without staying on the turbo.

Re: XTR 11-40 11 spd cassette on DA 9100?

Posted: Mon Mar 18, 2019 1:16 pm
by Lelandjt
deepakvrao wrote:
Mon Mar 18, 2019 11:41 am
Lelandjt wrote:
Mon Mar 18, 2019 6:09 am
Different frames have slightly different derailleur mounts so your results may vary but on most bikes 9100 needs the Roadlink while 8000 GS works stock. That's how we do it at Santana Tandems.
You mean an Ultegra takes a 40 without a hanger extender? Then would the 8050 Di2 GS also have the same capability?
Yes, that's the most common spec at Santana. But since frames differ slightly I can't guarantee it on your frame.

Re: XTR 11-40 11 spd cassette on DA 9100?

Posted: Mon Mar 18, 2019 6:28 pm
by spdntrxi
Lelandjt wrote:
Mon Mar 18, 2019 1:16 pm
deepakvrao wrote:
Mon Mar 18, 2019 11:41 am
Lelandjt wrote:
Mon Mar 18, 2019 6:09 am
Different frames have slightly different derailleur mounts so your results may vary but on most bikes 9100 needs the Roadlink while 8000 GS works stock. That's how we do it at Santana Tandems.
You mean an Ultegra takes a 40 without a hanger extender? Then would the 8050 Di2 GS also have the same capability?
Yes, that's the most common spec at Santana. But since frames differ slightly I can't guarantee it on your frame.

The RX805 (clutched ultegra) can take a 42t... 44t is kinda noisey.. I think it just touches the pulley

Re: XTR 11-40 11 spd cassette on DA 9100?

Posted: Mon Mar 18, 2019 7:30 pm
by Noctiluxx
Youre better off with a 46-32 crank instead.

Re: XTR 11-40 11 spd cassette on DA 9100?

Posted: Mon Mar 18, 2019 8:08 pm
by SilentDrone
spdntrxi wrote:
Mon Mar 18, 2019 6:28 pm

The RX805 (clutched ultegra) can take a 42t... 44t is kinda noisey.. I think it just touches the pulley
I hadn't considered the clutch derailleur so I looked it up. According to shimano it has the same specs as the regular Ultegra GS: 39T capacity, 34T max low sprocket.

I would assume they are the same other than the clutch. Anyone know differently?

Re: XTR 11-40 11 spd cassette on DA 9100?

Posted: Mon Mar 18, 2019 8:08 pm
by Weenie