I was disappointed to discover that the Shimano Di2 system on my Trek Speed Concept didn’t have enough buttons to support manual shifting or D-Fly (i.e. changing pages on your Garmin). I can live without the manual shifting, but not D-Fly, so I set to figuring out how to add extra shifters to the aerobars on the bike.

• 12-Speed Considerations: 00:23
• The Problem: 1:12
• The Parts: 02:21
• Cockpit Matters: 04:28
• Installation Tidbits: 06:17
• Getting To It: 07:46
• Janky Bar Tape: 14:02