Di2 weirdness

the_urban_spaceman

Hi. Something really weird has happened to my di2. I left it overnight to charge, and since then when I shift down the cassette (to about a third way down) it automatically goes into the big ring! Ie puts itself into the big ring without me touching that shifter.

Anyone got any idea what's happened?

Cheers

surfercyclist

Sounds like you've got synchro shift enabled.

the_urban_spaceman

Ah! I've checked syncro shift online and I'm certain that's it, thanks.

Am I right in now thinking that double tapping the button on the junction box will get me back to manual?

surfercyclist

I believe so, I've got Di2 but haven't enabled synchro (yet). Keep meaning to have a play sometime.

the_urban_spaceman

Ok cheers. I'll give it a go this evening. Thanks again.

bigmitch41

or you can Bluetooth/connect a laptop using the Shimano e-tube software and play about with the settings/update firmware etc...

phearnde

I've had full synchro enabled for quite a while now.. I use the buttons on the right hand lever to change up & down the gears, leaving the left lever big(er) buttons free to control my wahoo - really handy in the winter when warm gloves make the little buttons on the wahoo not so easy to press.

StillGoing

Would struggle without synchro shifting on a long ride. Left arm goes numb due to restricted blood flow to it making changing on the front difficult, especially with mechanical.

pilot_pete

I tried synchro shift but hated it! Just shows it’s not for everyone - what I disliked was going from a downhill (big ring) to uphill (steep enough to require little ring and bottom gear!) as I shifted to the little ring it would drop me down the rear block to get the next lowest ratio - which is really clever, but I wanted bottom gear! So swapped back to manual shifting, which I absolutely love.

PP

StillGoing

Pilot Pete wrote:

I tried synchro shift but hated it! Just shows it’s not for everyone - what I disliked was going from a downhill (big ring) to uphill (steep enough to require little ring and bottom gear!) as I shifted to the little ring it would drop me down the rear block to get the next lowest ratio - which is really clever, but I wanted bottom gear! So swapped back to manual shifting, which I absolutely love.

PP

Simply speed shift down on the rear by holding the switch down. but, Synchro can still be overridden during a ride by operating the front shifter in advance of your climb.