This is on my bucket list. Wanting some opinions on whether gravel bike is OK or mountain bike needed. Don't own mtb, but do have gravel. Thoughts?
Depends on how you ride and how fast you want to go.
First time on the GDBMR in 2013, I ran 80 mm front suspension.
Did the trip a couple years ago with a rigid steel frame, and did not regret my choice, though I have to say, the pandemic was tough on the gravel roads - a lot of guys thought they needed to see how fast their 4X4s could generate washboard. But then, this is what the manufacturers say gravel bikes are designed for.
If you're good at balancing on the pedals while on the go and keeping weight on the seat and bars light, then you're probably OK with your gravel bike. Just make sure you have a low enough gear, don't be in a hurry, and don't try to be a hero. And don't worry, you'll know when it's time to walk the bike through sketchy areas.
(Some of the racers think a carbon fiber, dual suspension bike would be fastest, because one would not have to get off and walk the tougher spots of exposed boulders and deep ruts of washed out sections of roads in Wyoming and Northern CO, but if so, one would want to start with brand new fork seals at the beginning of the ride.)
Best way to find out if the gravel bike can handle it? Get out there, try it out. Put your thoughts in this thread.