I have one button di2 shifters on the tt bars and also on brake handles with synchro shift option.
I was on a long spin last week and the battery died. On synchro Before it died the left buttons on both the tt bar and brake handles when pressed moved the gears down and the right buttons moved the gears up. When it reached a specific gear on the rear cassette it would automatically jump to the big ring or vice versa
When on manual or semi synchro the same buttons follow as above but I could hold the right button down for a few secs to go from the small ring to big ring and left button to go down from big ring to small ring.
when the battery died this got out of synch so I resolved the synchro shift by applying the settings below on e tube
Left TT gear - shift rear down
Right TT gear - shift rear up
Left brake gear - shift rear down
Right brake gear - shift rear up
when I apply like this the manual or semi synchro options no longer allow me to shift to the big ring or small ring holding the buttons down and they just change gears on the rear cassette. When I changed this to shift front they would only shift front and not rear. (I was looking for a dual option but didn’t appear to be available on screen)
Anyone got advice on how I can restore the best of both worlds again?
I have one button di2 shifters on the tt bars and also on brake handles with synchro shift option.
I was on a long spin last week and the battery died. On synchro Before it died the left buttons on both the tt bar and brake handles when pressed moved the gears down and the right buttons moved the gears up. When it reached a specific gear on the rear cassette it would automatically jump to the big ring or vice versa
When on manual or semi synchro the same buttons follow as above but I could hold the right button down for a few secs to go from the small ring to big ring and left button to go down from big ring to small ring.
when the battery died this got out of synch so I resolved the synchro shift by applying the settings below on e tube
Left TT gear - shift rear down
Right TT gear - shift rear up
Left brake gear - shift rear down
Right brake gear - shift rear up
when I apply like this the manual or semi synchro options no longer allow me to shift to the big ring or small ring holding the buttons down and they just change gears on the rear cassette. When I changed this to shift front they would only shift front and not rear. (I was looking for a dual option but didn’t appear to be available on screen)
Anyone got advice on how I can restore the best of both worlds again?
Posting in topic so I can see a response to this.
I don’t own the single button extensions shifters, but would if this was true. I can’t find it in the manual anywhere about holding it down and would be interested in the answer.
I may post this question in the Bikeforums mechanics section.
There is no long hold for a big/small chainring shift. In full synchro my guess is you held it down and it rapidly moved the rear derailleur enough steps (either direction) that it was time for a shift to either big or small chainring. The long holds can only be configured for actions like start/stop the head unit, swap the pages on the head unit, turn on light, etc… No long hold for chain ring changes. I wish that was an option as I’d prefer the single button setup. But I removed mine and switched to the 2 button. Now when I’m aero, I change gears (up/down) with the right aero extension 2-button setup (top button goes up the cassette and bottom button goes down the cassette) and the left extension 2-button I have setup to swap pages with single press and start/stop my garmin with long press.
Heck, I’d even settle for a setup like SRAM which I have on one of my road bikes. Right selector goes to the right down the cassette. Left selector goes to the left up the cassette and pressing both at the same time moves the front derailleur to the opposite chainring. I could get that, I’d go back to single buttons on the aero extensions.
Now that you say it that’s probably what’s happening.
That said - I am in a place where I can solve synchro shift by applying the settings referenced in the OP.
But when I do that I have no option for Manual FD shifting. Do you know is there something I can do to resolve that?
I don’t know of a setting to get a workaround. I’m baffled why they don’t have a FD shift built into any setting other than a single press on a dedicated button which then moves you off the 1-button setup to the 2-button. For those that have the single button shifters, you have only the option to go full synchro and have the left extension button to shift the RD one direction and the right extension button to shift the other and let the full synchro shift the FD automatically. If you want to go semi-synchro or manual, you HAVE to move from the 1-button to 2-button shifters and then you have your FD shifts on one 2-button shifter and the RD shifts on the other 2-button shifter. Or a possible workaround would be to program the shift buttons on your your brakes be the buttons that control your FD but then you’d have to get out of aero and that is just an odd setup.
I mean, seriously, how difficult would it be to push a software update to allow us to setup FD shifting with a press of both the left and right buttons at the same time??? Now of course, this would also require removing the actions of a button long hold of a RD shift that makes it move multiple gears steps rapidly. I’m perfectly ok with that as I never hold the RD gear shift button down to move multiple gear steps at once.
Agreed. I think I’ll stick with synchro shift for now. I think it saves my legs as I tend to hog the big ring. One thing Synchro has probably done for me is opened the door to a the idea of a single chain ring as with synchro you won’t get to the smallest cogs on the rear cassette in the small ring and largest cogs when in the big ring unless you change the default which wouldn’t make sense
Thanks for the guidance and insights all
I just had my first (hilly) race since switching to the all 1-button shifter setup (requiring full synchro) you describe.
While it was already annoying me in training, it is definitely worse in a race where you shift a little more agressively.
The moment when it jumps to the small ring (and shifts one gear in the back to compensate) is ALWAYS a mess. Nowhere near as smooth as i would manually do it on my Di2 roadbike or previously on my mechanical SRAM red TT-setup.
Aside from the fact that the shift itself is jerky, it afterwards takes about 2-3 seconds for the FD to readjust so that the chain doesn’t rub. is that normal?
I would love:
An option to do a dedicated FD shift myself by either long-pressing or pressing both at the same time etc)
failing that…
A way to reprogram the synchro-shift to shift as i would myself: First do the (one or two) RD shift(s) (in the opposite direction) and then drop the chain on the small ring. But do that fast so that it happens within 1 sec!
An option to do a dedicated FD shift myself by either long-pressing or pressing both at the same time etc)
failing that…
A way to reprogram the synchro-shift to shift as i would myself: First do the (one or two) RD shift(s) (in the opposite direction) and then drop the chain on the small ring. But do that fast so that it happens within 1 sec!
#1 agree 100% and this is a wish list item that Shimano needs to consider adding to the next update.
#2 I haven’t messed with the software interface lately, but from what I can remember, you can tell it how many RD gears to shift during the FD change as well as the speed of the process but I don’t recall if you can inverse the order.
I can say, having it paired with my Garmin 1030 and getting the audible warning that the next shift is a FD change has me trained so I can decided if I actually want to make that next gear shift or ride it out.
hi, yeah - i know about configuring the number of RD shifts. I reduced it to one from 2 already as that is slightly better.
The speed setting does (as far as i remember) NOT affect the speed of these shifts but only the long-press multi-shifts.
I mean, seriously, how difficult would it be to push a software update to allow us to setup FD shifting with a press of both the left and right buttons at the same time???
My understanding is that SRAM has a design patent on this shift logic, so you aren’t ever going to see it coming from Shimano.
I mean, seriously, how difficult would it be to push a software update to allow us to setup FD shifting with a press of both the left and right buttons at the same time???
My understanding is that SRAM has a design patent on this shift logic, so you aren’t ever going to see it coming from Shimano.