Originally Posted by
alfeng
Those who don't know enough to
complain don't ...
Nontheless, there have been numerous
queries about HOW to shift more smoothly when going uphill by comparative "newbies" who don't realize that the shifting CAN be better than what Shimano's mechanical Road shifters provide ...
FYI. Shimano's
Rapid Rise (reverse-pull) rear derailleurs AND/OR their Di2 shifter are two of Shimano's remedies [
see below for the OTHER, partial remedy] ...
HEY!
Apparently YOU have either chosen to mis-read what I have written about "dwell" over these many years OR you have been mindlessly echoing "Allen Nader" who is a pretender who I reckon did not have the real world experience with his bike that he wanted us to believe he had ...
Because, you are right, there is no "dwell" when
upshifting when moving the chain from 15-to-14, or similar gear changes ...
BUT, I have been referring to
downshifting to larger cogs when using Shimano's "large" lever ... (
again, the "Rapid Rise" rear derailleurs are ONE way to correct the problem with downshifting when using Shimano's mechanical shifters)
Of course, I had presumed that you-and-others knew that in the common parlance that when you "downshift" that you are going to an easier gearing ...
Did
/Do you
not know that?!?
Or, is this an instance of being
separated-by-a-common-language on the two side of the Atlantic?
I suppose THAT could possibly be your excuse due to your time abroad, but what about the others who claim that there isn't any "dwell" in Shimano's mechanical shifters?
OR, would you prefer that I not give you an implausible excuse to use?
Additionally, "dwell" handicaps Shimano's front derailleur shift to the outer Chainring, too.
Regardless (
even though you-and-some-others will undoubtedly choose not remember this in the future) ...

Excerpt from above (color added):
"Modern indexing shift levers use dwell, which is a hesitation between movements in the lever. These hesitations are timed to match the movements of the derailleur and the spacing in the rear sprockets ..."
http://www.parktool.com/blog/repair-help/rear-derailler-adjustments-derailleur
Q.E.D
...
So it is said. So it is written.
FWIW. THE
benefit of "dwell" is the innovation-and-ongoing-development of ramping-and-pinning which Shimano's Cogs & Chainrings have which are not necessary when using Campagnolo shifters IF the rear derailleur is (
almost ... +/- an infinitesimal amount)
perfectly indexed but which subsequently means that the indexing of a drivetrain which is actuated with Campagnolo shifters will shift smoothly if the indexing that is
indifferently set up OR if there is "cable stretch" ...
And, the lack of "dwell" in Campagnolo's (
+ SRAM's ... but, SRAM's front shifter lacks trim & the bean counters apparently figured it would be easier to sell the-first-on-the-block group that a lack of a second chainring was a better solution than simply adding a notch to the front shifter's indexing) shifters also means that a vintage, thin-and-unramped Chainring can be used with Campagnolo shifters without drama whereas a mechanical Shimano shifter will spend some time trying to get the chain to engage the outer chanring if the "step" is more than a few teeth.