Most likely not hydration, not weather, not food, not fitness. That would leave pacing, maybe you went out too hard at the beginning and tore through your reserves too soon, thus they were not there when you needed them on a very tough climb. BTDT. Twice this summer, got stuck in the middle of nowhere, felt like I was gonna die (running out of water and being out of cell phone range in 100 degree weather did not help either).
Maybe gearing, did you feel like you had enough gears?
Last edited by Lemond1985; 09-22-19 at 10:50 AM.