Originally Posted by
Banzai
I have noticed that double tasking a single lever for shifts makes the swing to a larger cog and/or chainring a very large motion compared with even my 105 group on a different bike. This is most noticable to me riding in the drops, where Shimano shifting is a bit more effortless. Unfortunately (or fortunately) I spend a lot of time in my drops, so it's something I often think about. On the hoods it doesn't really matter to me.
I think the idea that SRAM had for the DoubleTap was for quicker upshifting on the rear while riding on the hoods (think sprint finishes). More like "clicks" instead of "swings" on the small lever as compared to Shimano.
Downshifts are usually done on the hoods (more so during climbs). To me, SRAM has a shorter swing due to the action on a smaller inner lever - but is harder to do (tighter), mainly because you have to go over the upshifting mechcanism first. Downshifting on Shimano on the larger outer lever needs less effort due to more leverage.
On the front it's the same thing as well.
For me, shifts on SRAM's DoubleTap feel more deliberate, "snappier" if I should say so. While on Shimano it's a smoother action and is more refined.
As for Campagnolo, well... It's a Campagnolo!
