Originally Posted by
dtrain
The official Shimano charts don't really show any 11 speed and 10 speed mixing. I know the 5700 shifter wouldn't take advantage of the 6800's redesign...but I thought I'd heard that it'll still work.
The bigger question is why. If wheels and/or shifters are holding the OP back from a full 11-speed build, that's fine. But why not build with 10 speed derailleurs? I don't no about 'slack', but the RD jockey wheels are likely different.
I doubt the FD would work. The 6800 has such short throws, I think you would get very interesting shift behavior with the 105 shifters.