SRAM Mix N Match Groupset Question

[BRad704]

Nothing to sell, nothing to see here... Just some guy with too much time to think about weird compatibility questions...



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Will this work... KNOWING already that I will only get to use 10 of the 11 gears on the cassette. This would be because I have an 11 speed cassette with the larger cog I'm after (36t); and I would set the RD to stop at the 12t.



SRAM 10speed Exact Actuation Flatbar Shifter

SRAM 10/11 Speed Rival1x Exact Actuation Rear Derailleur

SRAM 11-36 11-speed Cassette.





I also know the right answer is "just get a 10speed 11-36 cassette". But I'm trying to see if this would also work.



Based on the pull ratio chart, I think it should work. Since the pull is the same for SRAM Mtb 10 and 11 speed shifters, the RD is getting the same input for both 10 or 11 speed shifts. Meaning the Cassette is also irrelevant as long as I'm willing to lose access to 1 cog.



The table below contains the cable pull of 10 and 11-speed shifters:

TABLE REMOVED BECAUSE IT WAS BAD DATA

[batman1425]

All sram exact actuation stuff will play together. The shifter is what determines the number of gears you get access to, meaning that 10 and 11s rear mechs are interchangable (both road and mtb) and become what ever "speed" the shifters are.

This will work fine. You should be able to tune which 10 gears you get, omitting either the largest or smallest cog.

FWIW - I currently have a rival CX1 (11s) rear der. being driven by a 10s X7 shifter on a 10s cassette on my round town bike. It would work just fine on an 11s cassette as well, just as you've described, omitting one of the gears.

[jtbadge]

You can get an Apex 11 speed trigger shifter for like $30, that's what I would do.

Cog spacing is different on 10 vs 11 speed cassettes, a ten speed shifter isn't going to index properly.

[BRad704]

Originally Posted by batman1425

All sram exact actuation stuff will play together. The shifter is what determines the number of gears you get access to, meaning that 10 and 11s rear mechs are interchangable (both road and mtb) and become what ever "speed" the shifters are.

This will work fine. You should be able to tune which 10 gears you get, omitting either the largest or smallest cog.

Excellent, thank you. That's what I was coming up with as well.

[BRad704]

Originally Posted by jtbadge

You can get an Apex 11 speed trigger shifter for like $30, that's what I would do.

Cog spacing is different on 10 vs 11 speed cassettes, a ten speed shifter isn't going to index properly.

So I've actually ended up ordering a 10speed 11-36 after creating this post. I'll delete it in a few minutes...

But for conversation... if the shifter is pulling 3.1mm for either 10 or 11 speed shifter... and the RD is compatible with both already... then it seems like the number of shifts is arbitrary, since the distance between each shift should be the same. right?

And I did receive an Apex1 shifter today, but the situation I'm in, I have to have a separate clamp... and the Apex is integrated. So it's going back to Amazon.

[BRad704]

Plot thickens.... measuring with calipers and the 11 speed cassette is closer together than the 10speed.

But... How...

[auto_rock]

Different derailleur standards have different pull ratios, ie the same cable travel will cause a different amount of movement at the derailleur cage.Edit - I see your question now, because on your table it's the same amount of pull for an exact actuation 10 and 11, so that seems incorrect. I'm also stumped and have nothing to contribute here.

[Keith A]

Moved this for the OP.

[yinzerniner]

Originally Posted by BRad704

The table below contains the cable pull of 10 and 11-speed shifters:

Brand Number of Speeds Shifter Cable Pull (MTB) Shifter Cable Pull (Road)
Shimano 10 3.4 2.3
Shimano 11 3.6 2.7
SRAM Exact Actuation 10 3.1 3.1
SRAM Exact Actuation 11 3.1 3.1
Campagnolo 10 – 2.8
Campagnolo 11 – 2.6

That table is for sure incorrect. The cable pull amount is different between SRAM 11s and 10s shifters. See velonews article explaining why, including the cog pitch differences:

https://www.velonews.com/gear/techni...with-10-speed/

To get your desired outcome you'd need 11s shifter, any Exact Actuation RD, and you'd need to set the high limit screw so that it doesn't shift into the 11t cog. Sometimes it works, other times you need to get a longer limit screw.

[BRad704]

Originally Posted by yinzerniner

That table is for sure incorrect. The cable pull amount is different between SRAM 11s and 10s shifters. See velonews article explaining why, including the cog pitch differences:

https://www.velonews.com/gear/techni...with-10-speed/

To get your desired outcome you'd need 11s shifter, any Exact Actuation RD, and you'd need to set the high limit screw so that it doesn't shift into the 11t cog. Sometimes it works, other times you need to get a longer limit screw.

Thanks for that. I’ve ordered the proper 10s cassette and I’ll be happy with that.

Here’s the key from that article.

Dear Hans,
No, that will not work. The shifts will not line up across the entire range, because an 11-speed cassette is not just a 10-speed cassette with an extra cog stuck on at the same spacing. Rather, the spacing between 11-speed cogs is narrower than between 10-speed ones


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