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:…

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