Preface
This entire saga started out with the Coefficient RR (Road Race) carbon handlebars. I saw these on Ian Boswell’s bicycle once and watched the video on the ergonomics and knew that one day I would have to have them. A story for another day, but I love these handle bars. I can’t imagine riding anything else.
Anyhow, after many miles on the tops of these bars I eventually noticed that there were two rubber grommets on the under side of the handlebars that felt like they could be buttons… my brain immediately kicks in and starts to plan how I can turn these things into Di2 satellite shifters.
I was surprised to find out that Shimano Di2 Satellite shifters are no more than two wire momentary switches. The only real issue is how I could fit a circuit board into a location that would be low profile as the location of the rubber grommets; however, I was over thinking this… I opened up Amazon to pick up some things…
Requirements
It’s dangerous to go alone! Take these…
Tools
- Soldering Iron
- Wire Strippers
- Knipex Stripper – not required
- Fume Extractor – not required
Materials
- Coefficient RR (Road Race) Carbon Handlebars 😁
- 3D Print Files
- Solder
- 2nd Gen Di2 Cable (EW-SD300) or 1st Gen Di2 Cable (EW-SD50)
- Buttons: any momentary switches worked, but I used these
- Epoxy