Beach Bob

I'm thinking about finding a TT bike and am not really sure how often I'd want dual shifters. My understanding (and please correct me if I'm wrong), is that if you want shifters on both bar sets, you are running Di2 as you can't run dual shifters on mechanical setups.

How often do you really need to shift if you're on the lowers? In my head, I can see it when accelerating from a stop, or possibly on some steep uphills where you get out of aero mode...

My instinct is that I'd want to go electronic just so I'm covered... thoughts?

FlashBazbo

I wouldn't ride anything but Di2 on my TT bike. Besides the situations you've described, if you have a traffic / obstruction issue where you have to jump quickly to the brakes, the dual controls save you a lot of time getting back up to speed. Generally, if you've got to do a rapid or emergency stop, you also need to shift way down at the same time. With dual controls, you can shift while braking in that circumstance and avoid several seconds delay.

And besides . . . shifting with Di2 in the extensions is a lot easier. Just a mouse click. You don't have to change finger or hand positions to make any shift across the range.

notmyke

^^^ same.
I had Di2 bar-end shifters on the aero bars, then found the TT brake/lever Di2 shifters for cheap on eBay.

My "winter" bike only has the Di2 bar-end shifters...and I can't stand it. For sure, I use those at least 80% of the time, but for being able to quickly get to the right gear when standing up...that other 20% makes a huge difference!

Suffice to say, I'm scouring eBay looking for another cheapie set of 6871 or ST-9071.

doubravsky 

Wait... dual shifters... as in both the bar ends and the brake? Damn.... now I'm gonna have to go spend a bunch more money... that sounds awesome. didn't know that existed.....

notmyke

Yeah - livin' the dream! Thing I hate the most is that I didn't figure this out a couple years ago.
(I don't have enough posts yet to post photos, but if you put the https in front of this, you'll get a look at one of my setups.)
://goo.gl/6g3Fpi
Double the shifting, quadruple the enjoyment!

doubravsky 

Wow... looks very cool! Thanks for sharing. So different from mechanical shifters.

notmyke

I found a right-hand STI TT shifter./brake lever a while ago for my "travel by air with it" bike and was pretty happy with just that (in addition to the bar-end shifters, of course); but then was recently riding in an area where I did 450m of climbing in a 50km ride...but elevation stayed between ~50m and 80m above sea level (translation: nothing but short steep little hills). Currently on the prowl for a left-hand STI TT shifter/brake lever.

fietsbob

Cable dual shifters, require a cable combiner, from 2 into one..
synchronizing the 2 of them
so that each acts on the rear derailleur, with its indexing
on each lever being separate,
will have a high demand on your skills as a bike mechanic..

Component weight consciousness , eliminates the only scheme
where the indexed shifting ,
is entirely inside the , (German) internal gear hub,
but it simplifies the dual lever problem.