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Old 04-04-08, 02:30 AM   #1
legstwelve
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XTR Shifters compatible with 105 Derailleurs?

I was wondering if the current generation of Shimano XTR components, specifically the sl-m970 and st-m970 shifters would be compatible with a Shimano 105 9-speed front and rear derailleur?
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Old 04-04-08, 06:25 PM   #2
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Is your 105 set up a triple in the front and a 9 speed rear?

If so, I think it should work as long as you are talking about mating 27 speed XTR shifters with 27 speed derailleurs.

What's the bike you are doing this on? What gearing will you be running?

Reason I ask is that the capacity on the 105 derailleurs wouldn't be a large as a set of 9 speed mountain derailleurs [ Deore, LX, XT or XTR ].
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Old 04-04-08, 06:54 PM   #3
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Don't think it will work. XTR is meant for a 22-44 crankset. Road is typically 3x-52. I've only read that it won't work correctly. If it worked correctly, Shimano wouldn't have come out with the flat bar road shifters & front derailleur.
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Old 04-04-08, 07:02 PM   #4
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Isn't the cable pull for a mountain front derailer different that a road front derailer? I have no experience with this, but I have read it here.
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Old 04-04-08, 07:09 PM   #5
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All current Shimano REAR derailers will work with all current Shimano shifters. Front derailers are road and MTB specific.
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Old 04-04-08, 07:21 PM   #6
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Originally Posted by bsyptak View Post
Don't think it will work. XTR is meant for a 22-44 crankset. Road is typically 3x-52. I've only read that it won't work correctly. If it worked correctly, Shimano wouldn't have come out with the flat bar road shifters & front derailleur.
However there is this:

Before the flat bar road shifters were marketed, many tandems and some hybrids came from the factory with road bike cranks and front derailleurs paired with mountain bike shifters. It was a common combination. My wife has a hybrid that came from Specialized equipped with a Tiagra front derailleur and LX shifters. My daughter's tandem uses a road style crank, 105 front derailleur and LX shifters. I KNOW that both of them work correctly because I've tuned them both.

For some reason I'm told that the opposite (road brifters and a mountain bike front derailleur) doesn't work. That's, however, a combination that I've never tried so I can't speak of that combination from personal experience.
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Old 04-04-08, 07:26 PM   #7
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I've seen 105 and Dura ace RD on mtbs. People like to run them because the cages are short and tucked in. It's amazing how many roots, stumps and rocks stick out on trails.
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Old 04-04-08, 07:52 PM   #8
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The original poster was asking specifically about using MTB shifters with road derailleurs. Why did Shimano release a flat bar groupset? Who knows? Marketing?

I once had a bike which had MTB shifters, and the derailleurs were Sora rear, and a generic FD. Never had a problem with shifting. The shifters control the amount of travel per click on the derailleur. So long as the deraileur in question can traverse the range required to shift all gears, you can use the combination.

I have used bar end indexed shifters (designed for road) to shift a LX rear derailleur as well. No problems. It is more important that the FD matches the type of crankset you have on your bike. MTB FD are designed to match the curvature of the 44/46 tooth chainring, while the road ones are designed for the 53 teeth ones. Having said that I have successfully used a 105 triple FD with my 26/36/48 chainset.

I have also used a brifter to shift a MTB Deore LX FD as well .... no problem. I am currently using a Campag brifter to shift a Deore XT rear derailleur.

The key is in the setup.
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Old 04-04-08, 08:35 PM   #9
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Originally Posted by legstwelve View Post
I was wondering if the current generation of Shimano XTR components, specifically the sl-m970 and st-m970 shifters would be compatible with a Shimano 105 9-speed front and rear derailleur?
The answer is no and yes.

Others posters have gotten close. Shimano rear shifting is compatible across the line- as long as the shifter's "clicks" match the number of cogs, it'll work. (-ish. There were exceptions, but they're no longer made.)

On the front, Shimano uses two different cable pull ratios for their derailleurs: one for "road" front derailleurs and one for "mountain". "Road" shifters and derailleurs use less cable pull for a given amount of movement than their "mountain" counterparts, so if you try to operate a "road" derailleur with a "mountain" shifter, the shifter will jam before it shifts the chain to the big chainring.

This is an issue with a lot of recumbents, since they typically use larger "road" chainrings with "mountain" style flat-bar shifters. Fortunately Shimano also makes a couple front derailleurs to handle this combination:
http://harriscyclery.net/page.cfm?Pa...ils&sku=FD4429
http://harriscyclery.net/page.cfm?Pa...ils&sku=FD7004

I put the FD-R443 on both of our Tour Easys. They have worked perfectly for a bunch of years.
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Old 04-04-08, 08:38 PM   #10
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Those top pro downhillers know whats up, as they use the Dura-Ace stuff on their rigs. Shimano stuff is all the same
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Old 04-04-08, 10:17 PM   #11
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Those top pro downhillers know whats up, as they use the Dura-Ace stuff on their rigs. Shimano stuff is all the same
Which front derailleur do they use? Can you point to a item-by-item breakdown of one of their bikes?
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Old 04-05-08, 05:50 AM   #12
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Thanks for all the responses, it looks like one of those situations where I'll just have to try it out and hope everything works. I have a 50/34 double crankset with an FSA fd which is designed for the compact crankset. It's promising what retro grouch says, and as I am using an older 9-speed drivetrain I'm fairly confident that the rear derailleur will work and hopefully the front derailleur will work with a bit of tweaking.

Now just to find some brake levers that can control dual-pivot brakes...
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Old 04-05-08, 06:34 PM   #13
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Shimano makes flat bar specific shifters for road front derailers, which have a different cable pull ratio then MTB front derailers.
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Old 04-05-08, 06:54 PM   #14
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I have one experience trying to use an MTB front derailleur and MTB triple crank (both LX) with 105 STI road brifters and it didn't work. The cable pull wasn't correct and I couldn't get all three chainrings to ever line up correctly. I wound up using a barend shifter (obviously friction).

At the other end, the 105 STI worked perfectly with the LX rear derailleur.
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Old 04-05-08, 07:56 PM   #15
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As was suggested to me elsewhere I've found the SRAM Attack trigger shifters will support my 105 fd and rd so I will probably end up getting them.

Last edited by legstwelve; 04-05-08 at 10:28 PM.
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