That doesn't invalidate my point. When we talk about mountain bikes, we are talking about the bikes that directly evolved from the people like Joe Breeze, Chri

That doesn't invalidate my point. When we talk about mountain bikes, we are talking about the bikes that directly evolved from the people like Joe Breeze, Chris Cunningham, Gary Fisher or Tom Ritchey who used to race against each other on old modified schwinn cruisers bikes in Marin County in the 70's. That doesn't mean they invented mountain biking, that Fausto Coppi or Louison Bobbet weren't "mountain biking" at the Tour de France, nor erase the existence of a multitude of bicycle tourers in the dirt decades before, like the cyclo muletiers in France, the Rough-Stuff fellowship in the UK or kids building "Scramblers" in the 1950's. Same with the gravel bikes, people didn't wait for the industry to invent a name for it to ride bikes in the dirt yet the bike with drop bars we used back in the days were just called road, cyclocross, touring or randonneuse. It is a term that is attached as much to the usage as to the period it started.