Haven’t seen many things on ultra racing, and for good reason, it’s kind of crazy (lol, not a diss at any ultra people!). I recently attempted Iowa Wind and Rock and unfortunately my new di2 battery was a dud and went blank on fifth ride, 200 miles and 15,000 feet in. I made a quick recap video in hopes to share a few tips and the experience. It was wild. Best of luck to anyone that does this stuff and looking forward to a normal 5 hour event!!
