Originally Posted by
gsa103
You could probably run a 105/5700 triple crank & left shifter with a 5800 rear & right shifter. The RD probably won't be able to fully take up the chain, so you'd have to be careful to avoid small-small combinations.
Feasible, but expensive & ergonomically pretty horrible way to do it. Running a different feel left & right hand shifters will feel off, and the ergonomics of the 5700 are poor vs the 5800, you also loose the benefits of the new design and much better shifting FD that the 5800 series has.