Short and to the point:
Will Sram Red derailleurs work smoothly with FSA carbon compact crankset (expecting to swap the chainrings for Shimano to accomodate) and Chorus Ergo shifters?
No, you pretty much have to match shifter and RD brand, with very few exceptions. There are Jtek shiftmates that can make the mismatch work, but they can be hard to find.
Crank should be fine with any brand.
Styrrell
Thanks guys, interesting replies.
I thought the same as Styrell that it was a no go. Seems that thanks to KEAU posting Len Zinn’s article, not only can they run comfortably but I can also look at Shimano/Sram hubbed race wheels for use too! Sweet.
Thanks for your assistance guys.
You’d probably be better off with a Campy front der, but the Ergos seem to work with anything. Chainrings should be fine. You are screwed on the Red rear der, though.
From DaveS on weightweenies:
"A Campy 10 shifter pulls 2.5mm of cable five times, 3mm twice and 3.5mm twice. A SRAM RD requires a uniform pull of 3.1mm per shift. It take a Campy shifter 5 clicks to pull the same amount of cable that SRAM shifter does in 4. That’s a full cog’s worth of positioning error after only a few shifts. It must work by magic.
J-tek makes a shiftmate that increases the average 2.8mm cable pull of a Campy 10 shifter, so it will correct some of the problem, but it can’t correct the fact that the pulls are not uniform. The last two pulls are already too large to start with and will only get worse if the pull ratio is increased.
If you take the ratio of Campy’s average cable pull to that of SRAM, you get 2.8/3.1= .903. Mulitply that times the cog spacing of 3.95 and you get 3.57. That amount of travel is far less than the 3.8mm spacing of 11 speed cogs.
There is some question about that 3.1mm SRAM cable pull number. I’ve also read it’s 3mm. That would give an average RD movement of 3.73mm, which is better, but still quite a ways off, particularly on the first 5 shifts, where the real pull in only 2.5mm.
The bottom line is that mixing nonuiform pulling shifters with a RD requiring a uniform cable pull is never going to work great."
Looks like jtek isn’t even selling a doohickey for for Campy/Sram anymore:
http://www.jtekengineering.com/shiftmate.htm
Some good info here:
http://www.ctc.org.uk/desktopdefault.aspx?tabid=3946
rruff, DaveS seems to be at odds with Len Zinn. His article linked in KEAU’s article says the Ergos work just fine with Sram rear der and Sram./shimano cogged wheelsets.
I don;t know of DaveS but know of Zinn and his vast experience.
And I thought my set-up was mish-mashed! It can work, but there are a lot of times when my shifting is less than ideal (on The Clown Bike). On my full Campy set-up (currently on my winter bike), the shifting is flawless and has been for the almost 10 years I have been running that gruppo. I can’t wait to get full Campy on The Clown Bike.
However, I trust Zinn - if he says you can make it work, then you likely can.
Good luck!
AP
*I thought the same as Styrell that it was a no go. Seems that thanks to KEAU posting Len Zinn’s article, not only can they run comfortably but I can also look at Shimano/Sram hubbed race wheels for use too! Sweet. *
No problem mixing Sram and Shimano cassettes since they have identical spacing… but the Red rear der is a no-go.
http://www.velocipedesalon.com/forum/showthread.php?6124-Zinn-Strikes-Again-Mixing-SRAM-and-Campy
I don;t know of DaveS but know of Zinn and his vast experience.
Uh… maybe I should make a collection of all Zinn’s screwups some day… this appears to be one of them. I have much more faith in DaveS.
It works great.
Running Chorus Ergos with Rival and its butter smooth.
For the SRAM stuff,
- anything for the RD.
- FORCE FD is super nice and versatile with the dual position option (its worth it and much nicer than any of the campy FDs IMO).
-Any crank
-I run a wipperman chain
-SRAM 11-26 1070
KW