Originally Posted by El Chaba

One thing that can’t be ignored in this discussion is technique. If the rider just moves the shift lever in one direction or the other to change gears and stops moving the lever when the shift is complete, rear derailleurs like the SunTour do a better job as they complete the shift earlier in the movement. Savvy riders with derailleurs like a Camp Nuovo or Super Record learned that if you made a quick motion with the lever to overshift a bit and pull back that the derailleur would make a very clean and fast shift. You learn very quickly how much motion is needed….It is similar to cracking a whip but less exaggerated. In racing it was pretty important to master the skill. Of course some people just couldn’t get the technique down and for them there was SunTour and Shimano…..