People getting hung up on the electronic shifting is cracking me up. Of course no one NEEDS electronic shifting, but it's a cool feature and personally I'd enjoy the opportunity to try out SRAM AXS for a few days. Unless I'm missing something, the BMC Roadmachine One is the top-of-the-line version of that bike. The one on BMC's website is like $12,000 and has SRAM Red and Enve carbon wheels. The other bikes are far more standard spec:
- Scott Addict 20 Disc - 105 and alloy wheels
- Cannondale - carbon mystery bike with Ultegra components
- Tarmac Disc SL6 Expert - Ultegra and alloy wheels
- Roubaix Sport - 105 and alloy wheels
Any of these bikes would be fine, but I'd probably rule out the Tarmac as the race geometry would be a little rough on me for a 7hr ride. I'd definitely want more info on the Cannondale before considering it. The Roubaix and Addict are lower spec 105. Of course 105 is perfectly capable for this ride, but I'd definitely get the BMC even if only used one gear all day.