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SRAM S951 "Yaw" cranks with Shimano 105 derailleur?

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SRAM S951 "Yaw" cranks with Shimano 105 derailleur?

Old 07-09-13, 02:46 PM
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Reeses
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SRAM S951 "Yaw" cranks with Shimano 105 derailleur?

Hey guise. I recently ordered a Scott CR1 Pro frameset, which uses BB30, which means I'm gonna be needing a crankset in a week or so. I've narrowed my choices down to SRAM Red, FSA SL-K Light, and FSA K-Force Light (but I'm definitely open to suggestions). However, I've also seen the SRAM S951 and from what I've read, it has a yaw feature that seems to be only compatible with the SRAM Red derailleur.

I'm gonna be running full Shimano 105 on my rig. Would the S-951 give me problems? Thanks~!
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Old 07-10-13, 08:54 AM
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Interesting question to which I don't have the answer. I'm considering doing the same thing. My research tells me it's the chainrings that are "optimized" for the Yaw technology- not the cranks themselves. It may require changing the outer ring- dunno. In my case I'll be changing the rings anyway (46-36). Which prompts the question- why can't one buy the crank and spindle without chainrings? Them chainrings are spendy! Before I take the plunge I'll be calling SRAM. If you want to try it first I'll be interested in your result.
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Old 07-10-13, 09:55 AM
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Should be fine from a compatible stand point and shift but just not as cleanly with out the Yaw FD with it.
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Old 07-11-13, 10:51 PM
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Since I'm going this route soon and the question came up, curiosity got the best of me. I'm not sure I can regurgitate the info exactly as I got it from my inside source in the engineering dept. at SRAM- but let's give it a go.

The "Yaw" technology and incorporated parts (FDR, chain rings, and shifter) are all a part of the new "SRAM 22" thing. That "thing" is that the entire cassette is accessed from either position on the front rings. That means what most of us know as "cross-chaining" is a thing of the past. You can access all rear cogs regardless of the front position. However, it only applies to 11sp groups.

How does "Yaw" work? The chain rings follow the path of (parallel to) the chain as it's moved from one end of the cassette to the other. The "Yaw" FDR pivots to follow the path of the chain so there is no rubbing between the cage and the chain as it's shifted across the cassette, in either front ring.

SRAM literature suggests that this "front ring" combo is not compatible with anything but "Yaw" derailleurs. To some degree that's true. There is a work-around so it can work.

I don't have a set in my hand, but I was told that if I saw the pivot on the hidden bolt (chain ring to crank) I'd understand. To use other derailleurs one needs to machine a chainring fixing washer (for lack of a better term) to hold the rings tight to the spider... or change the rings (which I intend to do.). The crank spider is the same.

My enquiry was fairly specific... can I use a Shimano DR on these cranks? I was told they don't do any testing of any compatibility between different components other than what the crankset was designed for. No surprise there, and I wouldn't have any expected any different.

I've got an "Exogram" on the way. When it arrives I'll have a better idea.
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Old 07-11-13, 11:09 PM
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That's the answer I'd expect from Sram they are not doing to tell you that other brands are compatible I have a Yaw FD on the older Red Group works great.
I see no reason why you can not use the crank with 105 FD it will shift just not a cleanly if you had the FD to go with it but should still work good.
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Old 07-11-13, 11:48 PM
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Originally Posted by JTGraphics View Post
That's the answer I'd expect from Sram they are not doing to tell you that other brands are compatible I have a Yaw FD on the older Red Group works great.
I see no reason why you can not use the crank with 105 FD it will shift just not a cleanly if you had the FD to go with it but should still work good.
I totally agree. They're not interested in building components to be compatible with other brands- hence the "lack of an answer" I got. My source does not work in marketing! They simply do not do that type of testing.

If my understanding of the system is correct, a Yaw FDR is a lot more compatible with conventional rings, than a "conventional" DR is with Yaw rings, and their mounting system.

Shifting "less cleanly" is not an option. The goal is to optimize shifting. That means using the right parts combo, or making the proper mods.

Last edited by reddog3; 07-11-13 at 11:51 PM.
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Old 07-12-13, 02:18 AM
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SRAM Red Front Derailleur - The new SRAM RED Front Derailleur changes everything. Instead of simply moving back and forth, the derailleur cage actually rotates to maintain a consistent angular relationship with the chain.
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Old 07-12-13, 04:21 AM
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If you look deep enough in the marketing material I believe that it states that the "Yaw Optimized" chainrings are that they are stiffer. I could go and measure them with a caliper later and get back to you though. Even if there is a spacing difference , well, that is what chainrings spacers are for.
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Old 07-12-13, 09:00 AM
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Heres my last thought on this yes rings are stiffer so thats better but as far as working with 105 FD as OP is asking it should be fine and actually shift good.
The FD is only a device to change chain line the ramps on the sprockets will get the chain up or down, the only added advantage to the Yaw FD is the fact that is rotates slightly to aid chain rub in cross chaining which you don't want to do anyways if you can help it.
The cage is stiffer than some other models so that will depend on what you are starting with in most cases better.
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