Originally Posted by swampy1970 .
Shocked how poorly the Shimano combination shifted? A second or two dwell?
I own two Dura Ace equiped bikes (7800 and 7900) and have run oddball hybrid versions of Shimano drivetrains that include 9 speed XTR rear mechs and 11-32 IRD cassettes and all have shifted flawlessly - no dwell, no waiting... No issues with out of the saddle hard efforts and changing up or down. I suggest you install your Shimano equipment as per the documentation. Sure, the 7900 cable routing from the lever under the bars may take a little bit of tweeking to achieve the same quality of shift as the 7800 but when done right it's flawless and lightening fast.
Alas. We have discussed this before AND you undoubtedly knew what I was going to say BUT it was necessary ([COLOR= #808080]IMO[/COLOR]) to address the issue, again, for those who were not familiar with what you may feel is my singular experience ...
But, you know that it is not a singular experience OR are pretending to have forgotten the numerous references in other threads in this very Forum AND it was even addressed at least one time on VeloNews.com ([COLOR= #808080]no, I
don't recall precisely when, but you can certainly wend your way through their Tech section to find it if you are motivated[/COLOR]) ...
Of course, you have the advantage of using more recent vintages of Shimano's STI shifters whereas I was referring to my experience ([COLOR= #808080]and, that of at least two other people whom I know[/COLOR]) with 6500 vintage shifters + one person who has 7700 shifters who admitted a failure-to-shift efficiently on at least one occasion...
- NB. when I have queried about the difference in the shifting of the 9-speed Shimano shifters & 10-speed, the prior comments were that it was the same; so, I have to presume that the "dwell" is still in-built. Perhaps, not.
- Perhaps there is less "dwell" with DA shifters than with lesser Shimano shifters.
Perhaps I am dense, but you will never convince me that the current design of Shimano's shifters are as good as they can be ...
But, OT, you will also never convince me of the superiority of double-butted spokes for the rider BUT 'I' will acknowledge that they are better for the wheelbuilder
because ([COLOR= #808080]
I will acknowledge that[/COLOR]) the resultant wheel might seem better because its comparatively flexy build will present itself as staying truer with less maintainence ... so, what do I know?!?
Originally Posted by swampy1970 .
I found on a short test ride that the main benefit of Di2 was shifting from multiple locations.
I'm guessing that I'm not the only rider to fail to see your issues with "dwell".
Well, your observation certainly
seems different from that of the "professional" reviewers + the first adopters ...
OR, are the former group simply shills for the various manufacturer's who advertise in their respective magazines and/or web sites?
And, the latter group doesn't want to admit that they were snookered by the bling factor?
Say it isn't so!
BTW. It's not clear to ME, but isn't the Rabobank-Giant Off Road team using Di2 shifters ([COLOR= #808080]or, are they using SRAM?[/COLOR]) & didn't Compton drop her chain during an important competition during this past season?
Nice, huh?!?
While I am sure it is possible to drop a chain when using a Campagnolo shifter + Shimano front derailleur, it would be exceedingly difficult to drop a front chain & would probably only occur if the derailleur's stops where not set properly.
Tangentially related, Andy Schleck must still rue having his SRAM rear derailleur phug-up ...
Quote:
I'm guessing that I'm not the only rider to fail to see your issues with "dwell".
Count yourself as being amongst the fortunate who have not had an occasional balky shift when using his/her Shimano shifters ...
- OR, perhaps you simply have superior technique which 'I' feel should not be necessary BECAUSE it clearly does not occur with Campagnolo shifters & supposedly does not occur with SRAM shifters ([COLOR= #808080]of course, SRAM drivetrains have other issues which are hopefully resolved with the forthcoming iteration & which will hopefully trickle down to the lesser lines sooner-rather-than-later[/COLOR]).
- of course, the least expensive Campagnolo shifter is as mechanically efficient as the most expensive Campagnolo shifter ... are you suggesting that Shimano slugs their non-DA shifters to varying degrees?
Again, if you are motivated, you can ferret out the periodic comments which relate to the situation of balky shifting caused by "dwell" where the offered solution is to accelerate momentarily to unload the drivetrain, etc.
The suggestion to accelerated momentarily before downshifting when the drivetrain is under a load is not a solution to a non-existent problem.
"Dwell" has been a problem with
some Shimano drivetrains in the past, and undoubtedly may remain as a problem in the future.
"Dwell" isn't a problem for ME because I made the decision not to use Shimano shifters.
BTW. For ONE RIDE, why don't you mount an older, un-ramped & un-pinnned outer chainring on one of your bikes (
[COLOR= #808080]I'm sure you must still have one[/COLOR]) and see how well your more recent vintages of DA shifters handle moving the chain from the inner to outer chainring in varying situations & report back ...
- to repeat myself ([COLOR= #808080]with different phrasing[/COLOR]), the Shimano 6500 shifter did not engage a ramped-and-pinned outer chainring as well as a Campagnolo shifter works with an un-ramped & un-pinned chainring
- maybe, the DA shifters are better