I have been trying to come up with solution to this for quite some time. Easy hack with original Di2 but no so much with Di2 9070. Since the firmware is in each component it is not a matter of simply splicing wires as it was before. The sprint shifter solution will not work unless you are willing to buy a pair of STI levers take out the black box, tuck it into the base bar grips and plug in wires.
The only other solution is the use a climbing shifter which is bulky or cut a STI aero brake lever in half and glue the it to the magura brake lever. This is what Garmin does.
there is rumor (and patents post on web) of shimano coming out with hydraulic STI levers for for road and TT/Tri. I can only hope that will include a Di2 version as well. And the rumor I heard maybe next year for release but who knows.
if anyone else has come up with something, I am all ears
cheers
The only other solution is the use a climbing shifter which is bulky or cut a STI aero brake lever in half and glue the it to the magura brake lever. This is what Garmin does.
there is rumor (and patents post on web) of shimano coming out with hydraulic STI levers for for road and TT/Tri. I can only hope that will include a Di2 version as well. And the rumor I heard maybe next year for release but who knows.
if anyone else has come up with something, I am all ears
cheers