I responded to a similar post you made in the gravel forum. The Diverge will do fine for a century. I rode one on my Diverge in October. You do need to make sure that you're prepared to eat and stay hydrated. I brought energy bars that I'd eat every 15 miles or so, and sandwiches that I ate at 36 miles and 67 miles (because there was a nice park to stop and eat at those points).