I did mine like this with the wireless unit. I have an aero bar where the bartape only goes up until the bend so I didnt want the cable between the two shifters going across out in the open. No holes by the shifters for internal routing.
I drilled both ends of the handlebar, and I routed a cable through the entire bar to connect the wireless unit to the bar-end junction. The wireless unit is then connected to the left shifter.
I did mine like this with the wireless unit. I have an aero bar where the bartape only goes up until the bend so I didnt want the cable between the two shifters going across out in the open. No holes by the shifters for internal routing.
I drilled both ends of the handlebar, and I routed a cable through the entire bar to connect the wireless unit to the bar-end junction. The wireless unit is then connected to the left shifter.
1 Attachment