There is a tonne of vague definitions of what a gravel specific bike is from a bunch of different sources, and I constantly am asked for my clarification of what one actually is. My definition is pretty damn simple: a bike spec’d with at least 35mm tires with room for bigger and a set of drop bars equates to a gravel bike. Plain and simple.
If you want to dig into the subject a little further. I’d suggest watching the embedded video! Skip to 2:50 if you aren’t into the Vlog stuff.