When I was attending a Cytech 1 course, there was a course solely for Di2, I learnt that you can programmed the button the other way round (something I didn't know after pressing the wrong button to shift down like Dammit did when he first tried his Di2 out).
When I was attending a Cytech 1 course, there was a course solely for Di2, I learnt that you can programmed the button the other way round (something I didn't know after pressing the wrong button to shift down like Dammit did when he first tried his Di2 out).