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I just finished setting up my first set of Campy Ergo shifters with the Quick Shift mechanism, Chorus QS shifters with a Centaur QS front derailleur.
I have to say, the QS effect is pretty minimal at best, plus it is very sensitive to setup compared to a regular Ergo/FD combo. Every pre-QS system I have built is sort of "set the inner stop, clamp the cable, set the outer stop, done". On the QS, I found the main problem is the different cable attachment compared to older front derailleurs (2003 vintage). The older FDs had the cable come up from the bottom and attach in an almost vertical line at the pinch bolt. The QS derailleur has the cable bend over to the outside near the top and attach at about 30 degrees above horizontal. This makes it very difficult to get a lot of tension in the cable. This was my main problem in my setup, the cable tension has to be set a little higher than normal to get full movement in the first click. Thankfully the frame I was building had barrel adjusters, good luck building a frame with no barrel adjuster cable stops and Campy QS!
In the end, yes the lever movement is slightly lighter. Of course with new cables, new shifters and a perfectly clean cable guide beneath the BB, I would expect it to feel better than my other bikes. Adjusted properly, the shifter requires 5 clicks to cover the double chainring range so in theory it should be possible to use a pre-QS Ergo shifter and a QS FD and not have to double pump the lever. But it would just be better to use a non-QS derailleur.
I have to say, the QS effect is pretty minimal at best, plus it is very sensitive to setup compared to a regular Ergo/FD combo. Every pre-QS system I have built is sort of "set the inner stop, clamp the cable, set the outer stop, done". On the QS, I found the main problem is the different cable attachment compared to older front derailleurs (2003 vintage). The older FDs had the cable come up from the bottom and attach in an almost vertical line at the pinch bolt. The QS derailleur has the cable bend over to the outside near the top and attach at about 30 degrees above horizontal. This makes it very difficult to get a lot of tension in the cable. This was my main problem in my setup, the cable tension has to be set a little higher than normal to get full movement in the first click. Thankfully the frame I was building had barrel adjusters, good luck building a frame with no barrel adjuster cable stops and Campy QS!
In the end, yes the lever movement is slightly lighter. Of course with new cables, new shifters and a perfectly clean cable guide beneath the BB, I would expect it to feel better than my other bikes. Adjusted properly, the shifter requires 5 clicks to cover the double chainring range so in theory it should be possible to use a pre-QS Ergo shifter and a QS FD and not have to double pump the lever. But it would just be better to use a non-QS derailleur.