On Wednesday, January 11, 2017 at 8:39:40 AM UTC-5, wrote:
On Wednesday, January 11, 2017 at 5:42:04 AM UTC+1, ixiz wrote:
Where can I find more information of what protocol Shimano di2 uses to change gears I would like to add an additional switch so I can change gears at the different hand position

Is that not a standard feature and buy extra switches from Shimano?

Lou

YES and no - where i want to put the switches is not standard and not available